Underground Moon Caverns
The Underground Moon Caverns, known colloquially as Moon Cave, is a sub-world, in the Moon Kingdom. It contains 5 Power Moons and 18 regional coins. Moon Cave Skip is used in most speedrun categories to skip this level, despite categories like 100%, All Moons, and All Purple Coins entering it later. This skips the boss fight against Madame Broode at the end.