Wario Land 3: Part 37: The West Crater (Gray Chest)

The volcano's eruption created a new opening called The West Crater. In this hot area, the Gray Key is blocked by a Flame Block. At 1:30, you must muscle through a hole in the wall to the left, eventually reaching a doorway. In the next room, use a Silky caterpillar to transform Wario into Ball o'Sting Wario, allowing him to bash through the String Blocks guarding the Gray Chest. The Gray Chest contains the Right Glass Eye. With both Glass Eyes together, a door opens somewhere within the Tower of Revival.