From the Super Mario Wiki
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Spike Koopas are bipedal Spinies with frog-like faces and Goomba-like fangs found only in Mario Party, appearing exclusively in the minigame Key-pa-Way. Their role is to protect Bowser's stash by preventing all four characters from unlocking the door to the treasure chest. If a character comes in contact with one, he or she will be stunned or drop the Bowser Key. They can be easily avoided by jumping and tossing the Bowser Key.
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