''Mr. Do!'' is a 1982 videogame. You are a clown who moves around a maze. You can dig new paths to avoid monsters and collect cherries. Kill monsters with a 'powerball' or drop apples on them. Kill them all or eat all the cherries to go up a level.

The object is to clear each level of cherries and/or monsters. You may kill the monsters by hitting them with your powerball (which bounces through the paths, taking unpredictable directions at junctions) or dropping an apple onto them. The level is also over if you complete the EXTRA box or collect the diamond which appears very infrequently ('Special', awards an extra credit).

You can dig extra paths through the solid parts of the maze in whatever shape you like. The apples will be found dotted around the screen in the solid parts. To construct traps for monsters, you must dig just under them so they fall into the path behind Mr. Do, then turn around and push the apple back to a path which turns downward, preferably just over the edge, and you have a trap! Wait for a monster (or a few) to appear in the path below, and push! If the monsters wait too long under the apple, they can become 'diggers' and dig away at the maze toward you! Sometimes they go under the apple and squash themselves. An improvement is if two apples can be lined up, so you are protected against a 'digger'. You can also dig up to an apple, wait for the monsters to follow you, then move aside and drop it before they can get out of the way.

The central target, from which the monsters appear, may be collected once all the monsters have appeared. This is noticed when it becomes a 'prize', (e.g., ice cream, biscuits, etc.). When you collect the prize, the Alphamonster and his four henchmen appear. The Alphamonster may be in the EXTRA box at the top or moving around the screen. The Alphamonster and his henchmen cannot easily be crushed under apples because they usually eat the apples! They can be killed individually with the powerball or, if the Alphamonster is killed, all the henchmen turn into apples.

This game had three sequels, ''Mr. Do!'s Castle'' (1983, also known in Japan as ''Mr. Do! vs. Unicorns''), ''Mr. Do!'s Wild Ride'' (1984) and ''Do! Run Run'' (1984). All of them had vastly different gameplay styles with ''Do! Run Run'' being the most similar to the original's gameplay. Similar games were ''Fruity Frank'' on the Amstrad CPC and ''Digger'' on the IBM PC.
* AmusementPark: The setting for ''Wild Ride''.
* ArtificialStupidity: See above. The monsters aren't very good at dealing with the apples, mostly running back and fourth in an attempt to dodge them.
* EdibleCollectible: There are cherries that can be eaten for points. They are laid out in batches of eight- collect all eight cherries in sequence and you're rewarded with 500 additional points. In ''Do! Run Run'', you can run laps around patches of pellets to convert them into fruits of increasing value.
* EndGameResultsScreen: After every scene that ends in a 3, 6, and 9 in the original game, the game displays your score for each level, and the completion time in minutes and seconds. After a scene that ends in 0, it plays a different result screen that always shows your average score/time for each level.
* EndlessGame: Every installment except for ''Neo'', though the patterns of stages repeat after a particular scene:
** In the original, the layouts of the levels repeat starting from Scene 11, and the colors of the dirt the player digs through repeat starting from Scene 31.
** In ''Castle'', the castle layouts are reset after Scene 8.
** In ''Wild Ride'', Scene 7 is identical to Scene 1, Scene 8 is identical to Scene 2, and so on. To increase the difficult, several additional hazards are added after each loop.
** In ''Run Run'', all the scenes repeat after Scene 10.
* FamilyUnfriendlyDeath: ''Do! Run Run'''s death animation. Mr. Do collapses onto his back and is electrocuted out of nowhere, leaving only his burnt skeleton. Thankfully it's not present in the Japanese version (''Super Pierrot'').
* FastTunnelling: In the first game.
* GenderBender: ''Neo Mr. Do!'' has a powerup that turns the title character into a woman, marked with he female symbol.
* HoistByHisOwnPetard:
** As in ''VideoGame/DigDug'', Mr. Do can wind up crushing himself under the apples laid out underground.
** In ''Do! Run Run'', you can also fall victim to your own rolling logs.
* NintendoHard: All the games exhibit this due to being arcade games, though the original game
* NoNameGiven: The only named monsters in the series are the Unicorns from ''Mr. Do's Castle'' and the Alpha Monsters.
* NonIronicClown: The title character himself.
* PublicDomainSoundtrack: In the first game, the main theme that plays throughout is taken from "Music/TheCancanSong" by Jacques Offenbach, while every three levels, Creator/LudwigVanBeethoven's "Turkish March" from ''The Ruins of Athens'' (better known to Mexicans as the theme song to ''Series/ElChavoDelOcho'') plays for an intermission scene.
* RealSongThemeTune: After you collect the "EXTRA" letters, the round is cleared, and you get an "extra" life. During this time, an intermission is played featuring the ''Tetsuwan Atom'' [''Anime/AstroBoy''] theme.
* SpellingBonus: Spelling the word E-X-T-R-A by hitting the Alpha Monsters with those letters (or in ''Wild Ride'''s case, just collecting the letters before they vanish) earns you an extra life.
* TunnelKing: Mr. Do, at least in the first game.
* TurnsRed: All of the series' monsters, except for the Alpha Monsters and the ghosts they release, are capable of transformation. In the first game, the red monsters could turn blue to tunnel through dirt (with said action being used more often on higher levels or if the player stalls for too long in the current stage). In ''Castle'', the Unicorn's final evolutionary stage gives it faster/smarter movement and eventually the ability to multiply, which seems to also be the case for the two monster types in ''Run Run'', except less rare and lacking the ability to multiply.
* UndergroundLevel: The first game is set entirely in one. Averted in Namco's mobile remake, where the game instead takes place in the fields of tall grass next to a nearby carnival (after all, Namco had already done [[VideoGame/DigDug its own game about digging undeground]]).