From the Super Mario Wiki
Floating Faces are large ball-like floating faces with a mustache. They bear a resemblance to Wario. They are found in Mario's castle in Super Mario Land 2: 6 Golden Coins. They bounce around a small room at diagonal angles. They can be killed by jumping on them twice (once on the Easy difficulty). Mario can also destroy them by a single spin jump, regardless of the difficulty level. They appear in a total of three rooms consecutively, with the first room containing one and the latter containing two each. They are the last defense barrier before Mario can finally face Wario.
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