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Super Mario Bros.

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Title Screen

Super Mario Bros.

Developer: Nintendo
Publishers: Nintendo (JP/EU/AU/US/CA), Samurai (IN), Hyundai (KR)
Platforms: NES, Famicom Disk System
Released in JP: September 13, 1985 (Famicom), February 21, 1986 (FDS)
Released in US: October 18, 1985[1]
Released in EU: May 15, 1987
Released in AU: July 10, 1987
Released in KR: December 25, 1987

CodeIcon.png This game has unused code.
EnemyIcon.png This game has unused enemies.
ObjectIcon.png This game has unused objects.
GraphicsIcon.png This game has unused graphics.
RegionIcon.png This game has regional differences.
Carts.png This game has revisional differences.

PrereleaseIcon.png This game has a prerelease article
BugsIcon.png This game has a bugs page

Super Mario Bros. was, and still is, probably the most well-known and biggest-selling NES platformer ever, especially since it was included with most NES units either by itself or with Duck Hunt. This game cemented Mario as the most famous plumber to grace televisions, with compelling gameplay, catchy music, and good graphics.

It's so ubiquitous, people can't get rid of these carts once they have them.

See also: leaked development materials for the SNES port included in Super Mario All-Stars.


Read about prerelease information and/or media for this game.
Prerelease Info
Read about notable bugs and errors in this game.

Unused Objects

To do:
  • There are more unused objects in the source code. See if any of them are in the final game.

Tree Branch


An object that Mario can climb up or down like a vine. It makes a "buzzing" sound as you climb, as though Mario is repeatedly hitting his head on something. It can still be placed in-game with a level editor. Although it appears as a brown flagpole ball, the actual 16×16 metatile that is used is unique to this object. According to the leftover source code from the All-Stars version this object is internally known as Wood-3, meaning that it was meant to be attached to the trees located in the Tree levels.

Unused Fire Bar Type

Enemy object 1E is a short Fire Bar that quickly rotates counterclockwise. This type is never used in any valid levels, however; its clockwise counterpart 1C is used only in World 5-4.

This Fire Bar type also exists in the Game Boy Color remake.

Unlike invalid enemies (such as glitch Fire Bars 20, 21, and 22), this type has a valid entry in the setting table:

      .db $28, $38, $28, $38, $28

      .db $00, $00, $10, $10, $00

The settings are stored in this order: Clockwise (1B), Speedy Clockwise (1C), Counterclockwise (1D), Speedy Counterclockwise (1E), and Long Firebar (1F). Fire Bar (1E) has both the faster speed ($38) and counterclockwise rotation ($10) programmed in.

(Source: doppelganger's SMBDis (Setting Table))

This behavior was later used in World A-4 of the Japanese Super Mario Bros. 2.

Unused Green Paratroopa

Enemy object 09 is a version of the green Koopa Paratroopa that simply walks in place. Strangely, it turns into a red Koopa Troopa when jumped on.

In the SMAS source code, 09 is revealed to be a scrapped enemy with the internal name 'fly green', whose code was almost completely commented out. It appears to be an early version of the green Paratroopa.

A small fragment of code relating to its size remains in the final game.

Scrambled Buzzy Beetle

Enemy object 13 is a strange enemy with the appearance of an upside-down, scrambled Buzzy Beetle. It has similar properties to 09, with the only difference besides its appearance being the fact that it turns into what appears to be an intangible shell after being hit with a fireball.

The SMAS source code reveals it to be another scrapped enemy with removed code. Its internal name is '-1 ( bakudan )', revealing it to be a scrapped version of the Spiny.

It is currently unclear whether any of its original data exists in the final game.

Unused Timer Setting

The upper 2 bits of the first level header setting byte determines the starting timer.

Value Bits Starting Timer
0 00xxxxxx 000
1 01xxxxxx 400
2 10xxxxxx 300
3 11xxxxxx 200

The timer starts at 200 if this setting is set to 3 (11xxxxxx), though no valid level actually uses it.

Likewise, the timer starts at 000 (causes instant death on normal levels) if this setting is set to 0 (00xxxxxx). While this setting is used by intros (such as the beginning of World 1-2), the game doesn't actually use the setting, since it completely disables the timer in these levels.

This setting is also used in cloud bonuses and World 4-2's vine warp zone, however the current level's timer is still valid there, so this setting goes ineffective.

Coin rooms (such as the one in World 1-1), water bonus (World 5-2) and World 8-4's water portion, however, use setting 1.

Unused Spiny Egg Behavior

The Spiny eggs are thrown by Lakitu in a simple straight-down way, with no horizontal movement whatsoever. However, this is not the intended behavior, and is actually the result of a bug! The eggs are supposed to be thrown out relative to the player's speed, Lakitu's speed, the player's position, and a pseudo-random value, as well as bounce off of any blocks or walls that they hit on the way down. This behavior is left unchanged in the Japanese Super Mario Bros. 2, so the same fixes can be applied.

The following patch will fix the bug:

Download.png Download Spiny Egg Speed Patch
File: SMBSpinyEggPatch.ips (25 B) (info)

This patch is intended for the Japan/US version of the game. The Bugs page has more information on the nature of this bug.

In Super Mario Maker this behavior has been restored and the Spiny eggs are thrown as though this patch is applied.

(Source: doppelganger's SMBDis (Spiny egg function), GoldS (patch))

Unused Pipe Behavior

The L-shaped pipes used in the intro leading to underground and underwater levels can be entered from the top like a regular pipe. However, it is impossible to experience that behavior during regular gameplay, since Mario automatically enters the side of the pipe, and as such this behavior goes unused.


An L-shaped pipe appears in World 9-3 of the Japanese Super Mario Bros. 2, and it is possible to enter this pipe from the top.

Misplaced Enemy

In World 2-3 and World 7-3, there's a green Cheep Cheep located above part of the level. It can't be seen or interacted with normally.

This Cheep Cheep is here because the second value of the page skip object in that area matches its ID.


Unused Variable

RAM address 03F0 keeps track of the number of blocks hit, though no routine ever reads the value stored here.

Unused Pointer

Map 01 (Worlds 2-2 and 7-2) has a third level pointer for World 3, which leads to the same place as the normal World 2 and 7 level pointers.

Unused World 7-1 Variant

Three of the four Paratroopas at the start and one of the first two Hammer Bros. have their "hard mode only" setting enabled. However, this level is nowhere to appear before World 5-3. This suggests that this level was meant to have an easier variant before entering hard mode (World 5-3).

Duplicated Scroll Stop Object

There are two identical scroll stop objects: 46 and 47. In the original source code, these are respectively labeled "SCRON" and "SCROFF", but they're connected to the same code, and only the latter is used by the game's levels.

Removed Tiles


The bricks and Bowser's bridge may have each used four unique tiles at some point in development, judging by the arrangement of existing tiles in the CHR data. The second and fourth tiles in each highlighted group are pieces of the block behind the title logo.

Piranha Plant's Stem Animation

The Piranha Plants' heads have a two frame animation. Interestingly, this also applies to the stem, however the two graphics used to "animate" it are completely identical, resulting in the stem being stationary. It should be noted that the Piranha Plant in All Night Nippon Super Mario Bros. (Or Japanese DJ Tamori, to be exact) does use this bottom half as part of the visible animation.

Above-Ground Bloopers

SMB 1000Bloopers.png

Although Bloopers normally appear only in water levels, they can be placed in non-water levels just fine and will award a whopping 1,000 points when stomped. Most other "impossible" ways to kill enemies, like hitting a Podoboo or Bowser with a Starman, only award the default 200 points, though Podoboos also have the stomp code defined.

Given that Bloopers appear in non-water levels (such as World 1-3) in the Japanese Super Mario Bros. 2 and award 1,000 points, this behavior was likely intended all along.

5-1 Starting Castle

SMB1 NES Castle oddity.png

For unknown reasons, most likely an oversight, World 5-1's starting castle is not the 3-tiered one as seen in every other world. This was not fixed in the SNES and GBC remakes.

(Source: original discovery: Supper Mario Broth, further research: Halfbit)

Regional Differences

Please elaborate.
Having more detail is always a good thing.
Careful, you'll lose an eye.
This page or section needs more images.
There's a whole lotta words here, but not enough pictures. Please fix this.

European Version

Japan/US Europe
Super Mario Bros (NTSC) underwater.png Super Mario Bros (PAL) underwater.png
Japan/US Europe
SMB1J 5-2 Underwater Section.png SMB1E 5-2 Underwater section.png
  • Just like in Vs. Super Mario Bros. and Super Mario Bros. 2, in all underwater areas (Worlds 2-2 and 7-2 plus the underwater sections of 5-2, 6-2, and 8-4), a block was added in the European version over the exit pipe to close the one-tile-high gap. In the Japanese and US version, it is possible to clip into that gap in Super/Fire form and get stuck in the wall with no way out other than letting the time run out.
Japan/US Europe
SMB1J 8-2 1st Page.png SMB1E 8-2 1st Page.png
  • In World 8-2, the starting positions of the Koopa Paratroopas were changed.
  • The Japanese and US version had a bug where if a lot of enemies were on-screen, the Springboard sprite could load into a piece of memory normally used to load power-ups or the flag at the end of the level, allowing these to overwrite each other. The European version added a check to prevent this from happening.
  • In the European version, the lowest position a Blooper can reach on-screen was lowered by 4 pixels, allowing them to, unlike other versions, hit Super or Fire Mario if he's standing on the ground.
  • Originally in the Japanese and US version, the branch of an enemy object would add 12 pixels to the player's vertical position. In the European version, it decides whether Mario stomped or got hit depending on the enemy branch of the enemy object.
  • Mario's initial downward acceleration at the start of the level is higher.
  • Mario's vertical acceleration on springs is now defined.
  • The movement function for Cheep Cheeps was drastically simplified.
  • In the European version, the vertical difference deciding whether Mario stomped or got hit depends on the enemy.
  • Rather than doing an ASL (Arithmetic Shift Left) on the injury timer, the value is set explicitly.
  • On water stages, Mario's vertical speed is set to 0 after nullifying.
  • Some enemies (more specifically: Piranhas, Bullet Bills, Goombas, Spinies, Bloopers, and Cheep Cheeps) have a larger hitbox.
  • The second tone of the coin grab sound effect is different.
  • The death theme is slightly different.
(Source: MrWint's smb-dis)

Revisional Differences

To do:
More versions: e.g. FDS, Virtual Console. Might also be worth adding in games like All Night Nippon Super Mario Bros. and Vs. Super Mario Bros.

Super Mario Bros. + Duck Hunt

The PPU control register 1 address was changed and the reset stack pointer was changed to a jump to $8000.

(Source: eientei95)

Super Mario Bros. + Duck Hunt + World Class Track Meet

This version seems to be based on the international version.

Super Mario Bros. + Tetris + Nintendo World Cup

This version seems to be based on the European version.

Nintendo World Championships 1990

Original Nintendo World Championships 1990
SMB Title.png NWCSMBNESTitle.png

The player options and top score are removed from the title screen. Notably, so is Mario, resulting in a static screen instead of gameplay demos.

Pressing Start to start the game doesn't work. Instead, the game starts by itself after a few seconds.

Original Nintendo World Championships 1990
SMBNESStart.png NWCSMBStart.png
  • You start with 99 lives. Your lives are also capped at this amount.
  • The lives counter has been modified to display two-digit numbers correctly.
  • The game can't be paused.
  • The game ends when you collect 50 coins.

Anniversary Edition

Original 25th Anniversary Edition
SMB1J Question Block.gif SMB25thAnniversary Question Block.gif

In the 25th Anniversary Edition for Virtual Console, bundled with specially-marked Japanese and Australian Wii consoles, the question mark on the ? Block was changed to "25".