From the Super Mario Wiki, the Mario encyclopedia
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Roach Smash is a minigame in Wario: Master of Disguise. The player must smash the cockroaches that walk by on the touchscreen. Depending on the minigame's difficulty, there is a certain number of cockroaches that must be smashed under a time limit of 45 seconds in order to win. If the player fails to crush the required number of cockroaches before the timer reaches zero, they lose the minigame.
After the minigame is encountered once in the main game, it becomes available to play anytime in the third tab of the extras menu. Here, the player can select between five difficulty levels, each requiring a certain amount of cockroaches to be squished in order to pass to the next level.