Use the secret room in the tutorial level to unlock the Full Gearbox. Then at the world selection screen, hold R and press Select. If you entered the code correctly, the Screw Bit will turn yellow.
Get the Proof of Mastery item. Then at the file selection screen, hold L + R and press Start.
Purchase the Hard Drill when it becomes available at the shop. It will allow you to access the secret MaiMai room in the tutorial world. In the room is a four digit combination lock. There are three unlock code levels that each unlock its passwords, as well as the passwords of the previous level(s). First, choose one of the digits and press Start while the drill is inserted to reset the code to 0000. Then, set each of the digits of the unlock code to their correct number in order. When the correct unlock code is entered, the lock will automatically reset. You can continue entering another unlock code, or enter one of the effect codes for the level unlocked, or a lower level. If you leave the room the unlock codes must be re-enterd.
Level 1: Set the third number to 1, first number to 2, fourth number to 3, and second number to 4 in order to display "2413".
Level 2: Set the third number to 8, first number to 6, fourth number to 5, and second number to 3 in order to display "6385".
Level 3: Set the second number to 8, fourth number to 2, first number to 3, third number to 5 in order to display "3852".
The following codes can only be enabled after the corresponding level code (or higher level code) has been entered. There is no required order for the digits to be entered. When a correct code is entered, a chest with the bonus will appear from the purple brick pipe in the secret room.
|Frog Pajamas Costume||5746|
|Rock Star Wallpaper||1814|
|Cute Clothes Costume||2094|
|Drill Dozer Coveralls Costume||9025|
|Thief Threads Costume||4181|
|Police Inspector Costume||2458|
|Control Center Wallpaper||8785|
|Blue Overalls Costume||5854|
|Fashionable Skirt Costume||2828|
|Futuristic Style Costume||1419|
|School Student Costume||5716|
The "Master Seal" and "Full Gearbox" unlock key combinations on various screens for extra effects. The "Sound Stone" unlocks the "Music/SFX Player" option at Gearmo's Save menu at the Trailer. To change Jill's costume, highlight her in the trailer and press L or R. The new wallpapers will appear in message borders and the interior of the Red Dozers' trailer.