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Tetris (Nintendo, NES)
Tetris is a famous puzzle game created by Alexey Pajitnov. This is the official licensed NES version, as opposed to Tengen's rendition (released six months earlier).
Having more detail is always a good thing.
Specifically: What needs to be modified to make these appear?
An airplane and helicopter can be found amongst the ending sprites. These aren't used in any of the endings of the game.
They do have valid sprite indices, and can be made to appear via hacking. The helicopter sprite is cut off in-game, but they work perfectly otherwise.
The first track in the NSF is unused, and presumably intended for the title screen (which is normally silent). It can be heard by setting RAM address $6F5 to 01 at any time. Alternately, use Game Genie code PESAZILA to replace music type 1 with this track or PAKVLZAA SYSTAXKP to play it on all non-FF silence tracks including the title screen.
Setting RAM address $BE to 02 (or using Game Genie code VUXEILXX) activates an unfinished two-player competitive mode, a rather surprising omission that was present in Tengen's rendition. While the basic rules are in place and the game is "playable", there are numerous issues:
Leftover Demo Recording Code
The game has an unused subroutine that records the player's input for use in the gameplay demo. This subroutine is activated when $00D0 in RAM is set to $FF. However, since the game tries to write the captured inputs directly to ROM ($DD00-$DEFF), it doesn't work correctly on the actual NES hardware or unmodified emulators.
|The Tetris series|
|Arcade (Sega)||Tetris (System 16, System E) • Flash Point • Bloxeed (System 18, System C)|
|Arcade (others)||Tetris (Vs. System) • Tetris: The Grand Master • Tetris: The Absolute: The Grand Master 2 PLUS|
|NES||Tetris (Tengen, Nintendo) • Hatris • Tetris 2 + Bombliss • Tetris 2|
|Game Boy (Color)||Tetris • Tetris 2 • Tetris DX|
|Mac OS Classic||Welltris • Super Tetris • Tetris Elements|
|SNES||Wordtris • Super Tetris 2 + Bombliss • Tetris 2 • Tetris & Dr. Mario • Super Bombliss|
|Virtual Boy||3-D Tetris|
|Nintendo 64||Tetrisphere • Tetris 64 • Magical Tetris Challenge • The New Tetris|
|PlayStation||The Next Tetris (Prototype) • Magical Tetris Challenge|
|Game Boy Advance||Tetris Worlds|
|Windows||Tetris Worlds • Tetris Elements|
|Mac OS X||Tetris Elements|
|Nintendo DS||Tetris DS (THQ, Nintendo)|
|Nintendo 3DS||Tetris: Axis|
|PlayStation Vita||Puyo Puyo Tetris|