From the Super Mario Wiki
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There is a room with many pillars, some in the foreground and some in the background. The only other thing in this room is a shiny treasure chest. After a few seconds, a thief will bounce in from the right, or fall from the ceiling, grab the treasure chest and run away. The player must tap him, so he drops the treasure chest and the player wins the game. The pillars in the foreground can get in the player's way, as the thief will go behind them, where the player cannot tap him. If the thief successfully escapes, the player will lose the microgame.