The Goombomb is an explosive from the Nintendo Adventure Book Monster Mix-Up. These weapons resemble Goomba Troopae. They seem to have been created from Goombas mixed with an explosive creature. Their name is a pun on "goomba" and "bomb". Foomby uses them as her secret weapon.

After Mario catches the Goombada twins, Foomby will deploy her Goombombs. If she and Goomby are not caught, Foomby will activate her Goombombs, and Mario will be banished to a desloate area. In the puzzle, the Goombombs are B and D.

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