Defeating Gooper Blooper
When he punches you with his arm, jump on it and it will flatten. Then, press B and pull his arm off. Do this for each arm. When the arms are gone, pull off the nose. Do this process twice to win.
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When facing Gooper Blooper the second time, do the same thing before, however you can sometimes just pull his nose off twice to win.
When facing Gooper Blooper the third time, use the same tactics used in the first two encounters.