Game mode

The game mode is, in simplest terms, what the game is currently doing as its set of routines. For the context of this article, we will consider the game mode as the exact combination of 2 different addresses: $10 and $11, the main module and submodule, respectively. An in-depth understanding of these addresses is not necessary for No Major Glitches categories; however, understanding them at a basic level is helpful for routing and executing any transition-corrupting glitch.

Submodule

The submodule is where most of the magic of corruption happens. Fundamentally, all changes to the submodule are incrementations; i.e. nothing is directly set. For example, an overworld mirror transition is submode 0x23. If the mirror were used when the submode was already 0x01, then the result would be submode 0x24. In fact, this is exactly what happens during a mirror wrap.

Submodule values

Main module		0x07 (Underworld)
Value	Process	Corruptable?	Corrupted from
0x00	Default state; player in control	No
0x01	Subtile transition	Yes
0x02	Supertile transition	Yes	West subtile somarias
0x03	Star tile hit	No	Somaria Door
0x04	Unlocking key door	No	West supertile somarias
0x05	Shutter doors opening/closing	No
0x06	???	No
0x07	Pit transition	No
0x08	Auto stairs that go up south to north	No
0x09	Cracked wall opening	No
0x0A	Torch-induced brightening	No
0x0B	Water drain	No
0x0C	Water Flood	No
0x0D	Flood gates	No
0x0E	Spiral staircase transition	No
0x0F	Entrance transition	No
0x10	Auto stairs that go up north to south	No
0x11	???
0x12	Up straight staircase	No
0x13	Down straight staircase	No
0x14	Damaging pit scroll	No
0x15	Telepad	Partially*
0x16	Peg switch	No
0x17	Pressure plate	No
0x18	Crystal fanfare	No
0x19	Mirror transition	Yes
0x1A	Triforce door	No	Subtile Mirror Door

* Telepads can be corrupted only with a YBA, but doing so results in a game crash