This article details various glitch meta-map scripts on Route 25 in Pokémon Red and Blue.The script is controlled by memory address D603.
Highlights
Tested at y=09, x=00 (bottom Route 24 approach across the path above the posts)0x03: Taking one step left from the above position (or the position one tile above it) may make the player character invisible. If done at a greater x-coordinate, the player's sprite may appear on the left side of the screen instead. This effect wears off after Flying, Teleporting or Escape Roping away, but not after entering a building. 0x04, 0x05, 0x08: May cause walking lag 0x06: One of the Trainer approach themes may play once, and then walking lag may occur afterwards 0x07: The same Trainer approach theme may play two times in quick succession. Afterwards, the game may freeze due to an invalid opcode (0xD3) at pointer 14:578D in the ROM 0x09: Same behavior as 0x07 after cursory analysis but the Trainer approach theme plays once 0x0A: The same Trainer approach theme may play but the game may freeze afterwards 0x0B, 0x0D: Same effect as 0x07 but without the change of music 0x0F, 0x15: Arbitrary code execution at region D7F1 in RAM
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