Mr. Do! was produced by Universal in 1982.
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. The monsters may be killed 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, it is important to 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 towards 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'.