Game Boy Color hardware

In-game reset:
Press A + B + Start + Select during game play to reset most Game Boy and Game Boy Color games.
Information in this section was contributed by Chris Enoch and jmis588215.

Invert colors:
Press Right + B at the Game Boy logo to reverse the screen and sprite colors. This may make the game easier to see in dim light.
Information in this section was contributed by Mike and Majora.

Other colors:
Other color schemes (as stated in the manual) may be selected at the Game Boy logo by pressing the following combinations. Note: This only affects regular and not color Game Boy games.
Information in this section was contributed by kaphilli, Tom, Nik98bag, carters, Mark, and others.

Combination	Background	Color 1	Color 2
None	Green, Blue	Red	Red
Up	Brown	Brown	Brown
Up + A	Red	Green	Blue
Up + B	Dark Brown	Brown	Brown
Left	Blue	Green	Red
Left + A	Dark Blue	Red	Blue
Left + B	Green	Green	Green
Down	Yellow, Red, Blue	Yellow, Red, Blue	Yellow, Red, Blue
Down + A	Yellow, Red	Yellow, Red	Yellow, Red
Down + B	Yellow	Blue	Green
Right	Green, Red	Green, Red	Green, Red
Right + A	Green, Blue	Red	Red
Right + B	Invert	Invert	Invert

1. Use tweezers or something similar to carefully open the plastic casing of the game.

2. Find the battery.

3. There will be a metal strip over the battery and it will be spot soldered on. Use the tweezers to separate the strip from the game. Be extremely careful not to break the streps.

4. There will be another metal strip facing the other direction attached to the bottom. Also separate that strip.

5. Remove the battery and take it to a store that sells similar products. Purchase a matching battery.

6. Place the new battery in the location between the two metal strips. Press the strips on tight.

7. Because the strips may be bent slightly, you may need to place something small on top of the completed battery setup so that it will be wedged between the battery and the outer cartridge.

8. Place the outer case back onto the game and snap it back into place.

9. Tape the game shut to make sure both halves of the cartridge do not separate.

10. Check if it works. You may have the battery positioned backwards, so you may need to open the case to correct it.