Spiny Piranha Plant
From the Super Mario Wiki
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The Spiny Piranha Plant, also known as the Spiky Piranha Plant, is a variety of Big Piranha Plants that appears in Super Mario Galaxy 2, acting in a manner similar to Prickly Piranha Plants. There is only one in the entire game, encountered in the Sky Station Galaxy during the Storming the Sky Fleet mission.
This enemy holds a key to the locked up Power Star nearby. It attacks in the same way as its purple variant: slamming its head onto the ground. The player cannot jump on it due to its spikes and must use the nearby Stretch Plant to defeat it by hitting its head when it is down on the ground. Once the enemy is beaten, Mario can collect the key and obtain the Star.
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