Editing WarioWare, Inc.: Mega Microgame$!

The game is based around the concept of playing very quick, simple microgames (over 200 in all) in rapid succession. Most games only last about four seconds on the lowest speed. There is a wide range of microgames, each of which vary heavily in art style and gameplay; some games feature simple stick figures against solid-color backdrops, some games show photographs, and some games are based on classic video games. A microgame makes use of either the {{Button|gba|Pad}} Control Pad, the {{Button|gba|A}} button, or both, depending on the task it gives the player. Shortly before a game starts, simple instructions such as "Dodge!", "Pick!", or "Catch!" are displayed. Each microgame features three difficulty levels. Depending on the game mode, the difficulty of microgames being played may ascend from the lowest to the highest difficulty level.

The game's main progression takes place in the stages of the Games mode, hosted by Wario and his friends. After beating a certain number of the microgames in a stage, the speed of the microgames, and occasionally their difficulty, increases. The microgames appear in a mostly random order. In addition, there is also an arcade-style mode known as Grid mode, where the player aims for a high score in a single microgame, which cycles through its difficulty levels before speeding up. This concept was first used in ''[[Mario Artist: Polygon Studio]]'' in the Sound Bomber mode, albeit in a much simpler form with only eight microgames in total.

In this mode, players can play any microgame they have previously encountered in the Games mode. When a microgame is selected in the Grid mode, a single challenge is repeated endlessly in an arcade-style format until they lose the microgame four times. Like in the stages, the player scores a point after every playthrough. The game cycles through each of the three difficulties the microgame has, with the first one being easy, the next being of normal difficulty, and the third being hard. After that, the speed of the game increases, and the game returns to its easiest difficulty, starting the difficulty cycle again. Each microgame has a designated score to beat, ranging between 10 and 30 points for regular games, and 5 for boss games. Upon meeting this score, the microgame is marked with a red flower.

|align="left"|A mix of the microgames of Jimmy and the aforementioned characters. However, Jimmy's boss stage, "[[Punch Out]]" (which starts at level 2), is the only boss stage to appear. The games also start on the normal difficulty level.

|align="left"|Only the boss stages appear in this stage, in a constant order and at a high speed. After beating Wario's Adventure, it starts at the first again, and the difficulty level increases like in normal microgame stages. If the player fails a boss microgame, they must redo that microgame again until they pass it. Extra lives cannot be earned.

In these games, the player aims for a high score, which are saved.