From the Super Mario Wiki
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The objective is to keep the three invaders from climbing to the top of the wall. The player must tap the characters to make them fall off the ladders. Once they drop to the bottom of the screen, they will start climbing again and must be tapped again, which is repeated until the time runs out. If one of the invaders climbs all the way to the top the game ends in a failure, with them striking a victory pose and the guards announcing the castle was taken.