В этой точке разработки, игра использует имена и музыку зон из Sonic 1. Есть неломаемые карточки с названиями зон из Sonic 1, но они невидимы потому, что код для показа посылает команду возврата. Убирая такую команду, карточки будут показываться с палитрой из Sonic 2.
To do:
Куда лезть в HEX-редакторе, чтобы удалить эту команду возврата?
Не забудьте проверить прототип Simon Wai, а также тот от 21 августа 1992 года на наличие этих титульных карточек!!!
Как и следовало ожидать, зона взяла из "Sonic 1", только теперь сломана коллизия, а графика местами глючит.
Из-за изменений, внесённые в данные этих столкновений с полом и склонами, Соник будет падать и терять жизни. Поэтому пройти уровень можно только касаясь интерактивных объектов, ровных поверхностей и возвышающих склонов с предварительным разгоном.
Нормально пройти S-образные туннели не получится, они тоже сломаны.
В игре есть старые данные столкновений, и может быть использована при помощи кодов Game Genie: AA1A-CEAL AA1A-CEFT AA2A-CEB0 AA2A-CEB6 AA0T-CAG6 AA1A-CAEC AA1T-CAA2 AA1T-CAF8 AA2A-CADJ AA2A-CADR AA1T-DECG AA1T-DEHN AA2A-DECN. Однако используя эти коды, коллизия будет сломана на остальных зонах, а также эти коды не заставят работать петли.
Кстати, петли теперь используют короткие переключатель планов, которые не работают в этой сборке.
Всё необходимые данные для загрузки зоны не просто есть, а даже обновлены для работы с форматами данных для Sonic 2. Например карта тайлов заменены с 256×256 на 128×128, а также обновлена графика для правильной работы режима для 2-х игроков (что является основной причиной глюков графики на основном режиме игры).
Во втором акте камера не блокируется при подходе к табличке, из-за чего она не загружает правильную графику, а в третьем акте точка блокировки камеры находится на 160 пикселей левее, чем должно.
Во всех трёх актах используются мониторы, отличные от монитора Sonic 1, что подтверждает изменение подвигов мониторов.
Из-за чего становится понятно, что монитор Tails 1-UP = Sonic 1-UP.
В спрайты Crambeat и босса отображается неиспользованная графика из Sonic 1.
В этой зоне используется графика пружин из Sonic 1, в других - Sonic 2.
Piranha - единственный бадник, графика которого не тронута, однако окраска иная из-за палитры Соника.
В отличии от пружин шипы здесь используются новые, в некоторых местах заметен недостаток, либо нагромождение. Они правильно отображаются в режиме отладки, но при размещении на уровне графика начинает глючить.
Палитра уровня не была обновлена до стандарта Sonic 2, поэтому цвет в некоторых местах ярко-салатовый (вместо серого).
Платформы во втором акте используются стандартные вместо высоких.
Marble Zone (Chemical Plant)
Это одна из других зон, которая виднеется в игровом шоу "Nick Arcade", её Демонстрация видна на заднем плане. До сброса образа в сеть это был единственный проблеск отличий.
Nick Arcade proto
Simon Wai proto
The background (which does not animate and has only one layer of scrolling) has a pink tint rather than olive-green, which was probably changed to make CPZ feel more industrialized than it does here.
A few of the buildings are different - this mostly applies to the ones made of rectangular lights, which are short and wide at this point but tall and thin in all other known prototypes.
The bottom section has more changes, with the Nick Arcade background having a lot more steel beams and a conspicuous absence of those square blue lights seen in the other builds. The Nick Arcade background reuses a few of the transportation tube tiles in the bottom-left corner.
The background seen in other versions is 128 pixels taller than the one in this build. It's all for naught, though, since the stage isn't tall enough in either build to see the bottom of the background. They might have been planning to change the vertical scrolling speed of the background, but it's the same speed in all known versions of the game.
Act 1
Full Maps
Nick Arcade proto
Simon Wai proto
Nick Arcade proto
Simon Wai proto
The layouts between versions are so different that they're not easily comparable, but the start of the Act stayed pretty much the same. The line of three rings was moved to the top of the rightmost platform and another vertically-moving platform was added.
Notes
There are a few more objects on the upper path, mostly rings, but they stop appearing halfway through the stage. This includes the path swapping objects that make the intersecting tubes and loops work.
The bubble launchers are in place, but the bubbles themselves are not implemented yet.
Transportation tubes do not function properly, letting Sonic fall out to the floor/pit below. However, the way they're laid out show that you may have had to run into the transport tube machines to go through them rather than break open a tube to enter.
Nick Arcade to CENSOR builds
Beta 4 onward
The loops have their early hexagonal corners, which made it to the CENSOR prototype before being changed in Beta 4.
Acts 2 and 3 are identical in layout to Act 1, indicating that there wasn't much work completed at this point. They use the same ring layouts as GHZ Acts 2 and 3.
While it hasn't been coded yet, there's art for the Chemical Plant boss in the ROM.
Some objects from the Sonic 1 Marble Zone are accessible via Debug Mode, albeit with corrupted tiles.
Playing this Zone after Green Hill will keep the broken art from GHZ, but with a different palette.
Spring Yard Zone (Hidden Palace)
Наверное, самая интересная зона, которая была вырезана.
Act 1 seems to have been worked on while the monitors were still using their Sonic 1 mappings, which explains why there is a Tails 1-Up monitor early in Act 1. The shield monitor would also be a ring monitor if converted to Sonic 2's mappings.
There are dinosaur and bat badniks present here.
Various unused badniks can be placed with debug mode, including the piranha, Stego, Gator, early Octus, and early Aquis. Most have glitched sprites, although Pro Action Replay code 01C1D8:0007 will fix most of their graphics.
If Sonic makes a precise short jump while rolling fast enough on the green platform after the first tube, he will clip under the platform after the second Redz, and fall into the submerged section of ground underneath. This was not fixed in any later builds.
The bubble sprites use the wrong graphics.
There is an emerald object which blocks a pipe to nowhere in Act 1. Many thought this was the Master Emerald due to being a large green emerald in a Zone called Hidden Palace, but it was actually supposed to be a breakable object like the rocks in Hill Top.
If Sonic rolls into the emerald, he'll drop into the pipe below it. This was fixed by the Simon Wai build.
If normally playing Act 1, it stops prematurely due to a slope which is far too steep to climb. If you use Debug Mode to go past it, there's a little more to see, including a non-functioning water slide.
Most of the Debug Mode objects have broken previews. The ones that don't are the ring, monitor, loop point, and dinosaur.
Similarly to Green Hill Zone, the palette has one wrong color (a bright green that is gray in all other levels). However, nothing uses the single wrong color here.
Nick Arcade proto
Simon Wai proto
The players' underwater palette is the same as in Labyrinth Zone in Sonic 1. This obviously works fine for Sonic, but Tails has some serious problems.
The proper underwater palette, matching the one seen in the Simon Wai prototype, is in the ROM at 0x0027A2. However, the game is still using Sonic 1's logic for loading the underwater player palette: If the Act number is 03, it loads palette 10 (Labyrinth Zone 4, aka Scrap Brain 3), otherwise it loads palette 0F (Labyrinth Zone 1-3). So, the intended underwater player palette is overwritten.
If you let the drowning countdown begin then jump out of the water, Labyrinth Zone's music will play.
Acts 2 and 3 have not been worked on. Act 2 recycles object placement from GHZ Act 2 and LZ Act 2's water levels, while Act 3 uses GHZ Act 3's object placements.
Player 2 can control the water level in Act 1 by pressing Up or Down.
The boss music plays in Act 3 if the camera moves past X coordinate $2BFF, but there is no boss.
Tails acts like he is on land while he is in water. Because of this, his movements are not slowed down and he cannot drown.
Labyrinth Zone
Uses Chemical Plant's tiles, Labyrinth's rippling, and Marble's ring layouts...and it's completely broken. It is unknown what this level slot was going to be used for before they re-arranged the level IDs but it is often speculated that it might have been for Oil Ocean (as it was one of the first zones to be worked on), Metropolis (again, one of the first zones to be worked on), Death Egg, or Genocide City.
While there are some strips of "land" (garbage data), it is otherwise like Genocide City and Death Egg in the Simon Wai and August 21 builds.
If you enter Marble Zone first, the game partially loads the layout for that level, regardless of the act.
The bossmusic plays in Act 3 if the camera moves past X coordinate $1C9F, but like in Hidden Palace, there is no boss.
About the broken layout, the reason why is because the game has special code that loads Green Hill Zone's chunks and layout differently; the game tries to apply this to Labyrinth Zone, but due to using Chemical Plant stuff it obviously doesn't work well.
Star Light Zone (Emerald Hill)
Более завершённая зона в прототипе и только играбельная без использования Выбора уровней. В Nick Arcade участник играет в Акт 1 и он должен собрать 25 кольц за 30 секунд.
This Zone features a badnik that was removed from the final version: a red-shelled snail. This Motobug-like enemy slowly moves around on the ground. When it sees the player, it charges at them (as much as a snail can charge at something, anyway). This enemy was replaced by Coconuts in the final game.
Act 1
Full Maps
Nick Arcade proto
Simon Wai proto
Nick Arcade proto
Simon Wai proto
In the Nick Arcade prototype, it's impossible to get back to the upper path once you fall down into the lower path. To fix this, the terrain on the lower path was raised a bit in the Simon Wai prototype, making it possible to reach the moving platform.
The three-ring line was not erased, so it's now embedded in the newly-raised floor.
There's a spike pit with a big moving platform that was completely removed from the final version, probably because it's a little early in the game to introduce something like that.
The cliff in the top-middle was raised as well, making the second floating platform more useful.
There are more spikes in the Simon Wai prototype: two below the first large floating section, and another one in the middle of the two that were in the Nick Arcade prototype.
The red spring at the bottom-right was removed after this prototype.
Nick Arcade proto
Simon Wai proto
The upper path is considerably simpler in the Nick Arcade prototype, which just consists of a few jumps over relatively simple terrain. In the Simon Wai prototype, this has been changed to add a piece of ground above the waterfall section, which is easiest to reach by using the new yellow spring to the left. The upper path also contains the first long quarter-pipe section in the Simon Wai prototype.
Note that the enemy placement in the Simon Wai prototype is a bit sloppy, especially in regards to the Buzzer enemies. The Buzzer on the top path seems like it might pose some problem to the player in the Nick Arcade prototype, but with the new layout, it's just placed oddly at the top of the quarter-pipe.
In the lower path, there's a red spring to the right of the Snail enemy. With the other spring in the previous section, this completes the first of the game's spring traps. This was thankfully removed from the final game.
Again, the ground on the lower path in the Nick Arcade prototype is flatter than the ground in the Simon Wai prototype. It's a bit emptier in the Simon Wai prototype, though - there are three rings that were deleted from the Nick Arcade layout.
Nick Arcade proto
Simon Wai proto
In the Nick Arcade prototype, if the player goes at full speed on the corkscrew path section, they'll just drop off into the top of the first waterfall seen here. The Simon Wai prototype changes this by adding a small quarter-pipe section that leads to a group of eight rings.
In the lower path, a diagonal yellow spring was removed in the bottom-left and the three rings were moved more to the right.
The Simon Wai prototype adds a new upper path to the right of the yellow spring by adding a floating section and adding more ground above the second right-facing yellow spring.
Again, the Buzzer enemies haven't been adjusted to the new layout yet, so their position no longer makes sense.
Nick Arcade proto
Simon Wai proto
The way to get to the floating platforms in the upper path was changed between prototypes.
In the Nick Arcade prototype, the player has to either jump to the right from the top of the big quarter-pipe or spin-dash up the quarter-pipe if they fall down.
In the Simon Wai prototype, the player can just use the yellow spring to jump to the platform.
The hidden path in the middle of this section was also changed between versions. It works properly in the Nick Arcade prototype, but in the Simon Wai prototype, the player can only get to the third ring before they hit a solid wall. Note that each prototype actually has the same number of rings, they're just covered up more in the Simon Wai build.
Nick Arcade proto
Simon Wai proto
The slope below to the right of the spikes on the lower path was changed to a small quarter-pipe in the Simon Wai prototype, and the solid block above said slope was changed as well. This seems to have been done to set up the path seen in the final version, but in the Simon Wai build it doesn't actually amount to much.
Act 2
Full Maps
Nick Arcade proto
Simon Wai proto
Nick Arcade proto
Simon Wai proto
There are only 13 rings here in the earlier prototype, compared to 25 in the later prototype. The Simon Wai prototype adds four rings above the wooden bridge, removes the three-ring line in the upper-left, takes away one of the rings from the four-ring string in the middle-left, and adds a large 12-ring group in the upper-right.
The diagonal yellow spring was horizontally flipped and moved to the right in the Simon Wai prototype as part of the aforementioned ring change.
A pair of spikes were added to the left of the Snail enemy. Be careful with that spring!
Nick Arcade proto
Simon Wai proto
An extra ring was added to the string above the lowermost wooden bridge.
The four rings far above the topmost bridge were moved down to be just above it in the Wai build.
The yellow spring and the two rings associated with it were removed.
The horizontal moving platform was replaced with an extended cliff section.
Nick Arcade proto
Simon Wai proto
The three-ring string above the spikes in the lower path was moved to above the spikes in the upper path. Hooray!
As is tradition, four rings were added above the wooden bridge in the lower path.
The spikes on the lower path were moved more to the right.
Nick Arcade proto
Simon Wai proto
The entrance to the 1-Up monitor is a bit more conspicuous and a little less easy to just fall into in the Simon Wai prototype.
The up-left diagonal spring was moved a bit more to the right for...some reason.
The two rings above the Buzzer were deleted, and a group of seven rings was added in the path of the up-right diagonal spring.
The lower path is much more treacherous in the Simon Wai prototype, with a lot of added spikes, both stationary and retracting.
The yellow spring on the ground is now a red spring in the ground.
There are only three rings above the lower wooden bridge in the Nick Arcade prototype. That's not four rings!!!
Nick Arcade proto
Simon Wai proto
The layout of this section was greatly changed by the time of the Simon Wai build. All of the yellow springs were removed, including the first up-left diagonal spring that leads to a tunnel that dumps out to the extra life monitor in the previous section.
In the Nick Arcade prototype, the tunnel that goes to the super ring monitor leads to a dead-end. In the Simon Wai prototype, the layout was adjusted so the player doesn't have to double back to the left.
The upper path is a little easier to reach in the Simon Wai build, and the upper path has also been raised up.
The super ring monitor was changed to an Invincibility monitor.
Falling platforms and Chompers were added to the waterfall section, and the Buzzer was removed.
Speaking of Buzzers, their sloppy placement is most evident here. Again, they make sense in the earlier prototype's layout, but in the Simon Wai prototype, one of them is partially embedded in the ceiling!
A single set of retracting spikes was added in the lower path.
A diagonal up-right spring was added below the start of the corkscrew path above this section. This spring leads to the top of the loop in the next section...
Nick Arcade proto
Simon Wai proto
...The loop, by the way, which is placed further up and to the left in the Simon Wai build, and is now fused with the platform at the end of the corkscrew section.
It's possible to get to the top of the loop from the bottom path by using the vertical moving platform in the Nick Arcade prototype. This is no longer possible in the later builds.
The section of the ground to the left of the falling floating platforms has more flowers and spikes in the Simon Wai build.
The underground section extends further to the right in the Nick Arcade prototype.
The yellow spring at the bottom was moved to the right and in the ground in the Simon Wai prototype, and more spikes were added to its left.
A Shield monitor was added at the end of the tunnel in the lower path.
The tunnel no longer exits to a wooden bridge with rings and Chompers in the Simon Wai prototype. This was changed to a pit and...nothing else, really.
Nick Arcade proto
Simon Wai proto
Remember the up-left diagonal spring on that loop? In the Nick Arcade prototype it leads nowhere in particular, but in the Simon Wai prototype, it leads to a new floating section with a 1-Up monitor. There's an additional floating platform down and to the right, but there's nothing on it.
The super ring monitor was removed.
These emerald hills weren't hilly enough in the earlier prototype, so the small quarter-pipe was enlarged (and six rings added), another small quarter-pipe was added, and the ground to the right of that quarter-pipe was elevated.
The two snail enemies on the lower path were removed, and eight rings were added.
Notes
Nick Arcade proto
Simon Wai proto
The animated cave tiles flash rapidly in the Nick Arcade prototype. They're at their final animation speed starting in the Simon Wai prototype.
This also applies to the tiles in Hill Top Zone.
Emerald Hill's debug object list includes Hill Top's seesaw platform, although it sees no use here in either Act.
This is the only Zone with a stage boss in both the Nick Arcade and Simon Wai prototypes.
Tails is absent; considering Sonic loses rings when Tails gets hit, this was very likely done to help the players on Nick Arcade. He's present from the Simon Wai build onward.
Spikes that hang from the ceiling don't hurt Sonic if he jumps up to touch them. If you use Debug Mode to hit them from the top, they will damage Sonic, suggesting that the only difference between the ceiling and floor spikes is that the graphics are vertically flipped. They work properly in the Simon Wai prototype.
In both versions, Eggman's vehicle is already parked on the spot instead of entering from the right.
If the boss is facing left when it finishes exploding, it will change direction and face right as Eggman begins to escape.
Scrap Brain Zone (Hill Top)
A preliminary version of Hill Top. Due to occupying the former Scrap Brain Zone level slot, there's a bit of residual weirdness. Read on for more about that.
Act 1
Full Maps
Nick Arcade proto
Simon Wai proto
Act 1's layout is complete, but the lower screen bound has not yet been changed from Sonic 1's SBZ Act 1. As a result, the Act cannot be finished.
Nick Arcade proto
Simon Wai proto
One ring was removed from the start of the stage, and the layout was changed from a downhill slope to a flat strip of land.
Nick Arcade proto
Simon Wai proto
The rising and lowering platforms in the lava are placed higher up in the Simon Wai prototype.
The pit with the first seesaw platform was removed from the Simon Wai build's layout.
The up-right red spring that leads to the upper tunnel isn't present in the Nick Arcade version.
A set of spikes was added below the rightmost set of rings in the lower path.
Nick Arcade proto
Simon Wai proto
There are no rings in the tunnel section yet, and the seesaw platforms and up-right springs aren't here yet either.
The four rings above where the seesaw will be were deleted, and three rings added to the right of the 1-Up monitor.
A set of spikes were added to the right of the small quarter-pipe.
Nick Arcade proto
Simon Wai proto
Besides the super ring monitor, there are no rings in this section of the Nick Arcade build.
Again, the up-right yellow spring isn't present yet.
The ground above the second seesaw was lowered in the Simon Wai prototype, making it a tad easier to get up to.
The third seesaw was moved from below the lift platform to the nasty lava pit. Some spikes were added to the pit's ceiling. Thanks.
The lift platform is a few pixels too low in the Nick Arcade version, so it doesn't properly line up with the guide line.
Nick Arcade proto
Simon Wai proto
From this point on, the only objects in the Nick Arcade prototype are those that the player absolutely needs to complete the stage, which includes seesaws and lifts.
Other than being mostly void of objects, the layouts are identical here.
Nick Arcade proto
Simon Wai proto
Since the Nick Arcade prototype only has one subtype for the lift platforms, the one that is supposed to be facing left is facing right and goes straight into the ground.
Nick Arcade proto
Simon Wai proto
The seesaw platform was replaced by a red spring.
In the Simon Wai prototype, starting at this point, the layout is several blocks longer than the earlier prototype. This was done due to the newly-added rising ground/lava section. To keep the player from going back once the rising starts, several one-way barriers had to be added. So, the layout was extended by a few blocks and the ceiling was lowered.
Nick Arcade proto
Simon Wai proto
The same changes can be seen here. The pit was widened as well.
Nick Arcade proto
Simon Wai proto
There's a small tunnel section at the top-left corner of this area in the Nick Arcade prototype. Replaced by a solid wall in the Simon Wai version.
The seesaw platform is further in the ground in the Simon Wai prototype.
Act 2
Full Maps
Nick Arcade proto
Simon Wai proto
Act 2 cannot be completed with Sonic, because if the camera moves past X coordinate $1EAF the game tries to load pattern cue $1E, referencing data that is not a pattern load cue, causing the game to read garbage art data as a pointer and subsequently crash with a blue screen. As the event handler is specifically looking for Player 1's camera X position to trigger the event, however, Tails can complete the Act.
Removing the art load cue will allow Sonic to go further into the level. After the point that triggered the art cue is reached, the player can fall off the level to go to Act 3, a remnant from Scrap Brain Act 2 in Sonic 1.
Nick Arcade proto
Simon Wai proto
Unlike Act 1, there are absolutely no objects here in the Nick Arcade prototype, so we're just comparing layouts at this point.
The ground at the start drops down in the Nick Arcade prototype, and the lava is lower as well. The player would probably jump on a spring to get up in the earlier layout, as opposed to the seesaw platform seen in the Simon Wai build.
The long slope down to the lower section seen in the Simon Wai layout is broken up by a small quarter-pipe in the Nick Arcade build. After falling to the lower path, it's impossible to get back up, which is probably why it was changed in the later prototype.
Nick Arcade proto
Simon Wai proto
Well, the Nick Arcade layout is obviously using the wrong blocks here. This was thankfully fixed in the Simon Wai prototype.
Nick Arcade proto
Simon Wai proto
The platforms and guiding lines for the lifts are higher up in the Simon Wai prototype. If there actually was a lift object in the Nick Arcade prototype, it would clip into the loop below, which is obviously not something you'd want.
Nick Arcade proto
Simon Wai proto
As in Act 1, the stage is slightly wider to accommodate for the newly placed one-way barriers.
Nick Arcade proto
Simon Wai proto
The same change can be seen in the paths below. The lowermost path opens up earlier in the Nick Arcade prototype.
Nick Arcade proto
Simon Wai proto
In addition to the standard layout widening, the Nick Arcade prototype uses the wrong blocks for two of the ceiling pieces. These might be remnants of an even earlier Hill Top layout.
Nick Arcade proto
Simon Wai proto
The last of the many widening-related layout changes. Oh, and the second floating platform was removed.
Nick Arcade proto
Simon Wai proto
The upper path at the end of the stage extends all the way up to the upper bounds of the level in the Nick Arcade prototype, which is a little much. Two of the cliffs and their accompanying guiding lines, as long as one long floating platform, were removed from the Simon Wai layout.
Nick Arcade proto
Simon Wai proto
The cliff at the start of the final cave section was lowered in the Simon Wai build.
Notes
While the parallax scrolling has been mostly implemented, the clouds (or whatever they are) in the background don't move on their own yet. The blue mountains far in the back don't scroll yet, either.
The lifts don't drop at the end of their path, and there is only one subtype: The one seen at the start of Act 1. They always move to the right and always stop at the same point.
The lava cannot harm you because the actual damage objects haven't been placed yet.
Hill Top's debug object list includes the Buzzer, Snail, and Masher from Emerald Hill. Only the Masher doesn't have its graphics overwritten.
The seesaws copy the center green orb for the weight instead of a flameless Sol, an element seen in a Sega Visions magazine preview.
Nick Arcade
Simon Wai onward
В Sonic 1, Scrap Brain Акт 3 - это на деле Labyrinth Акт 4. Labyrinth в этом билде сломан и использует графику из Marble/Chemical Plant и этот уровень не стал исключением. Выход к Final Zone до сих пор существует и можно активировать при помощи поднятия вверх и движения направо через Режим отладки. Палитра является комбинацией из той, что было в Scrap Brain Акт 3 и циклических цветов из Marble/Chemical Plant.
Также есть примечание, что Акт 3, если пройдено через Акт 2 разными методами описанными ранее, не будет пустым как Labyrinth Zone, но будет иметь собранный лейаут мусороной даты и графикой из Chemical Plant.
Final Zone
Hill Top's graphics are used. The Sonic 1 Final Zone used the graphics of Scrap Brain, so this is unsurprising.
Going left drops you over an edge to a dead end.
If the camera moves past X coordinate $2147, the game crashes with a purple screen. This is because the game tries to load the art for the final boss by loading art cue $1F which does exist, but references data that is not a pattern load cue, causing the game to read garbage art data as a pointer and lock up.
Through hacking to disable the art load request, it is possible to go further into the Zone. The Sonic 1 final boss' object number will load, but the boss' code is gone and replaced with a dummy object. Because of this, there's nothing to fight and hence no way to reach the "ending".
The level layout is actually that of Hill Top Act 1, with no rings or objects (which is odd considering Sonic 1 used the layout of Act 2). Playing past the point where Act 1 would normally end will simply lead you to a pit. Going past the pit with Debug Mode will lead to a large void before the beginning of the level layout loops over.
Beating the level by hacking a signpost into it sends you to the Sega screen. This is consistent with Sonic 1, as the ending could only be triggered by beating the boss.
To do: Find out what happens if you mod the Final Zone boss back in, and then beat him.
Ending Scene/Zone 06
By using Action Replay code FFFE10:0600 you can access Zone ID 06, which was the ending scene in Sonic 1. The stage uses Final Zone's music and reuses Green Hill's art and palette.
Unfortunately, it's also very much broken: The stage is mostly garbage data still leftover in the ROM, some collision is present, the stage reuses Chemical Plant's layout, and some pattern load cues, must be modified or otherwise the game will crash with a blue screen when starting the level. Green Hill Zone's Chunk Compression and level header also must be used here to prevent a crash. Trying to access Act 2 or 3 of this Zone will result in an Illegal Instruction error.
Special Stage
The game crashes while loading it due to bad pointers and missing art, but most of the code is based on the Sonic 1 Special Stage. It is possible to modify the code to where it won't crash, but not much remains of the Special Stage as the graphics have been deleted from the ROM, however the color palettes still work, and pretty much coding for all objects is still present in the ROM.
