Tetris DX GBC Inverse Mode
Load unused CGB palette in CGB mode (I just found this five minutes ago when I was testing code. Tetris DX actually contains an unused palette in Game Boy DMG mode if the game is forced to load in GB DMG mode. Use the third line to fix the checksum if you're using an emulator and CGB GBC bootrom otherwise the bootrom will hang indefinitely. May work with a Game Boy Game Genie cartridge. This set of codes also allows you to choose the CGB palettes as if it were a monochrome cartridge or DMG Game Boy game or GBC CodeBreaker device if converted. Original discovery: https://twitter.com/nensondubois_/status/1429970288628813824)
001-43F-E68
F01-51F-6E9
B01-4DF-2AA
Trivia: Tetris original and Tetris 2 / Flash also contain an internal hash that matches though the palette is less orange and more yellow and the blue blocks also display the same way and they're definitely distinct palettes.
I guess Tetris DX was in development at the time and the they were testing palettes early on and left the hash inside the GBC bootrom.
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