스크류 브레이커

Unlock codes for effect codes:
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.

Effect codes:
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.

Level	Effect	Code
1	Standard Wallpaper	2403
1	Frog Pajamas Costume	5746
1	Samurai Wallpaper	4089
1	Rock Star Wallpaper	1814
1	Cute Clothes Costume	2094
1	Drill Dozer Coveralls Costume	9025
1	Sound Stone	9434
2	UFO Wallpaper	2059
2	Thief Threads Costume	4181
2	Police Inspector Costume	2458
2	Full Gearbox	7867
2	Control Center Wallpaper	8785
3	Blue Overalls Costume	5854
3	Nurse Costume	2438
3	Happy Wallpaper	5074
3	Fashionable Skirt Costume	2828
3	Futuristic Style Costume	1419
3	School Student Costume	5716
3	Master Seal	7073

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 then press L or R. The new wallpapers will appear in message borders and the interior of the Red Dozers' trailer.

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Full Gearbox:
Use the secret room in the tutorial level to unlock the Full Gearbox. Then, hold R and press Select at the world selection screen. The Screw Bit will turn yellow to confirm correct code entry.

Hard mode:

Get the Proof of Mastery item. Then, hold L + R and press Start at the file selection screen.

출처 : http://www.gamewinners.com/game_boy_advance/DrillDozer.htm