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Mr. Do! is a classic arcade game from the early 1980s that has been ported to various home systems, including the Nintendo Game Boy. The original version of Mr. Do! was released in 1982 by Universal and was designed by Japanese video game developer Universal Research Laboratories (URL). It is an action-packed platformer where players control the titular character, Mr. Do!, as he attempts to collect cherries while dodging enemies and obstacles.

In Mr. Do!, players must maneuver their way around a maze-like level filled with cherries and enemies. To progress through each level, Mr. Do! must collect all the cherries, which are scattered throughout the maze-like levels. The main objective of the game is to avoid being killed by monsters or other obstacles while collecting all of the cherries on each level. As you progress through each stage, new enemies and obstacles appear, making it increasingly difficult to complete each level without dying or running out of time.

The player controls Mr. Do! using a joystick and a single button used for shooting at enemies or dropping apples on them when available. The player can also use special power-ups such as extra lives, invincibility, or bonus points to help them progress further in the game. As you progress through each stage, more powerful weapons become available such as bombs that can be used to clear away blocks and obstacles in order to reach distant areas or hidden items on certain levels.

Mr. Do! features several unique gameplay elements that make it stand out from other platformers of its time period such as its use of multiple paths across levels that require strategic planning in order to reach certain areas with ease; its clever enemy AI that reacts differently depending on how close they are to Mr. Do!; and its ability for players to transform into Super Mr Do!, which grants him temporary invincibility against enemies and allows him to break through certain walls with ease in order to access otherwise unreachable areas in later stages of the game.

Overall, Mr. Do! is an entertaining classic arcade title with simple yet addictive gameplay mechanics that will keep players coming back for more as they attempt to master each stage and achieve higher scores than before by collecting all the cherries before time runs out or they get killed by one of their many foes present within this enjoyable adventure title for the Nintendo Game Boy system..