From the Super Mario Wiki
One Wiggler is on the top screen and many are on the bottom. The player must touch the Wiggler that matches the Wiggler on the top screen and if correct, the player gains five seconds to the time limit and a new one begins. If the player picks the wrong Wiggler (when the Wiggler starts to move in Level 4, or if the player chooses the wrong one for a certain number of times), then it will get angry, turn red, and deduct 10 seconds from the player's time limit, who then cannot choose again for three seconds. The Wigglers start out sleeping for the first three levels, but begin to move when the player progresses onto the fourth level, increasing the difficulty. The circles on the top Wiggler is the hint to finding the bottom one. The timer begins with 20 seconds, and can go up to 50; the game will end if the player chooses the wrong Wiggler too many times, or time runs out, which will make the Wiggler turn angry and face the player, or the one that the player should have picked will have him woken up.
This minigame also appears as a Puzzle minigame in New Super Mario Bros.
In multiplayer, the timer starts with 30 seconds, and no time is added or removed. Instead, players lose one point for the incorrect one, and get one if it is correct. Once the timer reaches zero, the player with the most points wins.
Touch the Wiggler on the Touch Screen that matches the one on the top screen. Choose carefully, though; he has a terrible temper.
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