Waluigi is the boss seen at the end of Sky Mountain 3. He is in the original Koopa's Revenge.
He drives a snow drill through snow, and Koopa must avoid falling stalactites and exhaust from the drill. These will hurt him.
To defeat him, Koopa must jump on a low snowdrift and then jump on him. But, Koopa can easily jump on him without the aid of the crazy snowdrifts if he has a blue shell.