I hate this game with a passion. The game lags way too much and the fact that you hit so many notes just to reach "Cool" or "Maniac" and then to hit the wrong note or miss it and to be braught back down to the last stage you were in is kind of stupid. I think there should be a three strike count and THEN be braught back down to the previous stage.
It's simple to beat Robo-Rob the Pycho Corn-On-The-Cob, just go back to level 36436 and then break past the false wall to your left, you'll find a venting system, after you go through there and take threel lefts and one right you'll be in the control room, shut off all the lights and wait for Hanky The Christmas Poop to appear and steal his Christmas Poop Cap, wear it while facing Robo-Rob The Pycho Corn-On-The-Cob and use your Christmas Poop Powers and he'll explode giving you extra Corn Points for when you face his brother Casey The Canned Corn. Good Luck!
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