Wario Land 3: Part 58: Cave of Flames (Red Chest)

After starting the level, go left and bounce off the enemy with your High Jump Boots. In the next room, the Red Key is hidden between the rock pillars; fall down the correct two to reach it. Then cross a gap into the next room and climb. Get a Doughnuteer to transform into Fat Wario, then use the extra weight to bash through the Doughnut Blocks blocking the Red Chest. The Red Chest contains a Minicar, a small trinket to keep.