The Colossal Hole

The Colossal Hole is a level located in the east part of the Music Box World which appeared in Wario Land 3. It is only unlocked after Wario uses the three conch artifacts to make the volcano erupt.

This is an underground level, it has some owls, UFO shaped like enemies and a Thwomp-like enemy. This level is unlocked along with The West Crater.

Grey Chest : Blue Snake Eye (right)
To get this treasure, Wario has to use his Puffy Form to get the key. He'll use the same technique for the grey chest located at the left side of the level.

After getting two of the snake's eyes, the blue snake door will open in Tower of Revival.

Red Chest : Air-Pump
To get this treasure, the player needs the Garlic Treasure. Wario first has to play a minigame of Golf, then go down the ladder at the far left of the minigame door. Then, he has to avoid the UFO enemy, break the solid blocks and enter the door at the far right.

Then, he has to take the spearhead to break the floor and get the red key. After doing that, he has to come back where the UFO enemy is and use his Puffy Form and avoid the spikes to go up. Then, he has to enter the door at the upper left which was blocked before by a minigame block. Then, he only has to break the solid blocks and open the chest.

The Air-Pump makes the ice blocks rise in The Pool of Rain and Bank of the Wild River.