This page contains Drill Dozer Codes for GameBoy Advance called "Full Gearbox" and has been posted or updated on Feb 13, 2008 by natvv. Let us know what you think of this Code by thumbs voting.
Once you have unlocked the Full Gearbox using the secret room in the tutorial level, you are able to replay any world with all three gears by using its effect. To activate it, hold R and press Select while on the world select screen. The Screw Bit will turn yellow to indicate that you have activated the Full Gearbox.
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