2 Enemies

There are three types of pests: shellcreepers, sidesteppers, and fighterflies.

• Shellcreepers look like turtles. They move slowly, and it only takes one hit to flip them over.
• Sidesteppers look like crabs. They move the fastest of all the pests, and it takes two hits to flip them over. After taking one hit, sidesteppers move faster.
• Fighterflies. They move by taking short hops, and can only be hit when touching the ground.

There are other enemies that do not need to be killed to clear the phase.

• Slipice. They move slowly. A hit instantly kills them. A new one is respawned in a few seconds if the previous one is killed. They can freeze a platform, turning it into ice, making it harder to maneuver Mario. If a platform is iced, it is returned to normal at the start of the next phase. If all three ice-eligible platforms are iced, no more slipices spawn for that phase.
• Icicles. They start appearing on Phase 16, after the third coin phase.
• Red Fireballs. They bounce diagonally. Mario can kill a fireball by hitting the ground as the fireball bounces; killing a fireball is unwise, as one soon respawns and moves faster. If the red fireball makes a complete circuit of the screen, it disappears and then respawns moving faster, effectively limiting the amount of time Mario can safely take to complete a phase. Normally, only one fireball is present; after the fifth coin phase, Phase 29, two fireballs are present simultaneously.
• White Fireballs. (sometimes called hurricanes) They move horizontally, spawning on one end of the screen and travelling to the other. They bounce at regular intervals, making it risky to jump over one.

3 Phases

• Phase 1-2. Shellcreepers
• Phase 3. First coin phase; POW not replenished
• Phase 4. Sidesteppers
• Phase 5. Sidesteppers and shellcreepers; this is the only phase in the game that has both sidesteppers and shellcreepers.
• Phase 6. Fighterflies
• Phase 7. Fighterflies and sidesteppers
• Phase 8. Second coin phase; POW replenished
• Phase 9. Slipice are now present on every phase; fighterflies and shellcreepers.
• Phase 10, 11. Fighterflies and sidesteppers
• Phase 12-14. Same as 9-11, but the fireballs are more frequent
• Phase 15. Third coin phase; floors turn invisible; POW replenished
• Phase 16-21. Icicles are now present on every phase; otherwise same as 9-14. Fireball frequency is decreased on phases 16-18.
• Phase 22. Fourth coin phase; POW replenished
• Phase 23-28. Same as 16-21, but fireball frequency is maximum and icicles are more common.
• Phase 25. Phase counter replaced with a red "KO".
• Phase 29. Fifth coin phase; POW replenished
• Phase 30-35. Same as 23-28, but now two red fireballs appear on each phase.
• The same pattern of 7 phases repeats for the remainder of the game.

4 Scoring

• Kicking off a pest: 800 points. If you can kick off multiple pests at one time, the value increases to 1600, 2400.
• Each coin is worth 800 points.
• Killing a slipice is worth 500 points.
• Killing a white fireball (hurricane) is worth 200 points. It is possible to kill it by hitting the floor just after it bounces.
• Killing a red fireball is worth 1000 points. This is usually a bad idea, as it immediately respawns and then moves faster.
• You can kill an icicle as it is forming, but this is not worth any points. If you touch an icicle after it has formed, but not dropped, Mario dies.
• Getting all 10 coins on the coin phase is worth 5000 the first time and 8000 later times.
• Flipping over a pest is worth 10 points.

5 Strategy

Usually, you should try to clear the phase as quickly as possible. Risking a life for 800 extra points is not usually worth it. The danger level increases as the phase progresses, because the red fireball gets faster.

You should try to kick off as many pests as possible at the start of each phase. If you do not kill some of the pests quickly, you can get stuck in a situation where many lives are lost on one phase.

Use the POW only if you expect to lose a life, especially if you may lose control and lose multiple lives, due to too many pests onscreen. Try to save at least one charge left in the POW, because standing on the POW is a useful escape strategy. Remember when a coin phase is approaching, so you can freely use up the POW when you know it is about to recharge.

The enemies behave deterministically. You can anticipate where they will be. The white fireballs spawn at regular intervals based on where Mario is standing. Anticipate where you will need to hit a pest, and stand elsewhere to draw the white fireballs. Only icicles spawn randomly, and the time interval between icicles spawning and dropping is constant.

You can jump over a pest, or walk under a fighterfly. Jumping over a white fireball is possible, but only at certain parts of the screen. Jumping over a fireball should be a last resort.

If a sidestepper is about to wake up, hit it again to wake it up. This way, it won't change color and increase speed. It usually pays to let fighterflies speed up, because their slow speed makes it more likely that a fireball or icicle will kill you before the fighterfly is in position. Notice that the last enemy onscreen speeds up to maximum if it is a sidestepper or shellcreeper. It sometimes pays to flip over a fighterfly, knowing you won't be able to kick it off in time, just to speed it up.

6 Comparison of versions

• The Japanese arcade version of Mario Bros. features an extra life every 30000 points, compared with only one free life per game in the English version.
• The NES has all game features except icicles, but the animation of the original has been simplified; for instance, the turtles can not be seen 'naked'. It is more stingy with time on the coin phase. The NES does not have the invisible coin phase.
• The Atari 7800 version is similar to the NES version, but with worse graphics.
• The Atari 5200 version has much less colors than the Atari 7800, but the animation is almost as detailed as the arcade version
• The Atari 2600 version is the least faithful of all versions. Due to 2600 limitations, there is only one pest per floor at a time. You can kick off the slipice as it is icing a floor. Iced floors only heal at the coin phase.
• The Apple II version included the invisible coin phase and icicles. However, the game is slow due to system limitations.

Screenshot on the Atari 2600	Screenshot on the Atari 5200	Screenshot on the Atari 7800	Screenshot on the NES
Atari 2600 ( 1983)	Atari 5200 ( 1983)	Atari 7800 ( 1988)	NES ( 1985)

7 Trivia

The musical introduction at the beginning of the game is the beginning of first movement of Mozart's Eine kleine Nachtmusik.

8 External links

• Mario Bros. entry on the Killer List of Videogames
• Category at ODP

Arcade games Mario Bros. games NES games Platform games Atari 2600 games 1983 computer and video games

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