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To practice all of the safety bonus stages in guillotine knives you go to the Dumbest of the Dumb, tap on each of the three stages (four stages once Adrenaland opens) to ride the train over and go to the safety round. Tap on each of the stages in a row before you play the Dumbest of the Dumb, then go there and you’ll replay one of the three safety bonus rounds – and likely get a much higher score because all three are fresh in your memory.

After you do that you won’t be able to play Woodworking Knives (the safety bonus stages) again immediately. You can change that by waiting a few minutes, or by shutting down the app and then reopening it and going to one of the levels to try it again. Do this as many times as you want for endless practice of the Machine Knife for Metal Working.