Come out of the tunnel and turn left, jump over to get ball. Travel on ball down to bottom floor. Go up ramp on left, jump up tunnel, there are some mousetraps on left and piece of cheese on right. Jump towards the cheese but keep going up as far as you can till you get to a room where there are 3 steam pipes. Go to front left and climp wall then follow 2 planks down the across 1 more plank to a room where there is 1 electric pipe. Climb pipe, jump out to right and there is a mousetrap and grate. Stand on grate and jump up and go to left. Jump over 3 steam pipes then jump up and go left and there it is!!!