After you get to the top, go right across the ledges to the treasure. Go left, then hop up on the crate and go all the way up on to make your way to the treasure. Then, when the section is finished and McCoy lands on the ground, go right an drop through the floor when you see the spot. Shoot through the hole to hit the barrel and make it explode. You should notice soon an Iron Crate on the other side of the wall, along with a TNT barrel under it and a hole in the wall. When riding the elevator, go as far left as possible until up against the wall when you reach the second section.

Follow the Bouncing Ball - Kill six Enemigos with Power Balls.Elevator Operator - Finish riding the elevator without taking any damage.Cart Carnage - Run into 9 enemies with a Mine Cart.Tunnel Racer - Beat the level in 4:00 (four minutes).Rumble in the Tunnel - Find the Enemigos' hideout and finish the Rumble battle.