From the Super Mario Wiki
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The objective of this game is for the player to dig up a fish fossil. The player has to tap to reveal the body, head and the dorsal fin of the fish. Each part must be tapped twice to be fully revealed. Once this happens, the fossil comes back to life and flops around, and the game is won. If the player has not revealed the fossil, the game will be lost. When the game is won, if the fish flaps up to the top right corner, a cat paw will reach out and stop it from moving.