Changing a Single Byte Saves Me Seconds Every Day!
summary
Reverse-engineering a Game Boy Tetris cartridge, this person dumps the ROM with yellow bags and a flashcart, inspects bytes with a hex editor and debugs in SameBoy emulator; a single machine-code byte that encodes state (value 25) gets replaced with 6 to skip an 8‑second copyright screen that can already be button‑skipped after ~4 seconds, and the patched ROM runs on real hardware, saving seconds every startup.
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chapters (10)
- 0:00Tetris hacking intro
- 1:29Reverse engineering Tetris
- 2:12Game Boy basics
- 3:37Inspecting ROM in hex editor
- 5:20SameBoy for debugging
- 6:22Memory and game state theory
- 7:24Discovering control byte
- 8:27Skipping copyright screen
- 9:10Testing on real hardware
- 9:32Key takeaways
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