Mario Bros. is an arcade game developed by Nintendo and released on June 21, 1983. It was also released on the NES under the Arcade Classics Series series of games (a version itself later ported to other systems), Atari 2600, Atari 5200, and Atari 7800 as well as a large multitude of home computer systems. The game is often stated to be the first appearance of Luigi in a game; moreover, Nintendo officially acknowledged this as well during the Year of Luigi that commemorated his debut. However, this is incorrect as Luigi actually had previously appeared in the Game & Watch game of the same name, though the arcade game was in development first.[citation needed] Beyond featuring the Mario brothers, the Game & Watch game bears no similarity to the arcade game. This was the first game to introduce coins, pipes, and POW Blocks.
Mario Bros. is also included as a separate minigame, functioning like the original game with updated graphics, in the two-player mode of Super Mario Bros. 3, for Mario & Luigi: Superstar Saga, and all four games in the Super Mario Advance series.
The game features a simple stage in which the player plays in an endless game. Much of the gameplay appears to have been inspired by an arcade game named Joust. Enemies come from the pipes on the top and head downwards, where they may enter the pipes again to return to the top. The game features 22 unique phases (although Phase 2 was removed from non-Japanese versions of the game), and after the last phase has been completed, it merely loops the phase order from then on, the screen will still read "Phase 23" onward up to "Phase 98" (99 in Japan). After reaching Phase 98/99, screen text will stop incrementing, though the order of unique phases still loops. The phase counter at the bottom of the screen reads "KO" from Phase 25 onward.
The goal in each phase is to defeat all enemies, which is done by jumping up and hitting the floor below enemies. This flips them, giving the player the chance to kick them away, which is rewarded with 800 points. Enemies that are kicked over in succession quickly enough after the first will award 800 more points, up to 3200 points. The highest score that the game can display is 999,990 points, and scoring any more will overflow the display and make it start counting from 0 again. The POW Block can also be used to flip enemies; however, it can be used only three times. After an enemy is knocked away, a coin (a "wafer" in the Atari 2600 version of the game) appears from one of the pipes, and gives 800 points when collected. When all enemies are defeated, the player continues to the next phase. In later levels, different types of enemies and harming fireballs appear. From time to time, a bonus level appears where all the coins have to be collected in order to get an extra 5,000 points (during the first bonus level) or 8,000 points (during the second bonus level onwards). The POW Block regenerates after the second bonus level and every subsequent bonus level. Unlike the arcade original, upon reaching Phase 100 in the NES version, the screen reads "Phase 0", and completing it will start incrementing the phase counter again as normal.
