Genkotsu

Genkotsu are enemies in Super Mario Land that appear in the Chai Kingdom. They dwell in Warp Pipes like Piranha Plants.

Only two Genkotsu appear in the twelfth and final level of Super Mario Land, World 4-3. They behave in a similar way to Piranha Plants, only they move quicker and are immune to the Sky Pop's missiles. They behave as a group - when one fist goes back into a pipe the other will come out shortly after, making it difficult for Mario to get past them.

In the second playthrough, a third Genkotsu appears in the first pipe to the left in front of the 18 coins.