To use the debug functions, it is necessary to have Controller 2 plugged in when you start the game. Otherwise, all the debugging features will be disabled, and the game will run noticeably slower.
Small, coloured squares at the bottom right of the screen show which buttons you are pressing.
Access Map Select
Press L + R + Z on Controller 1 to open Map Select from anywhere in the game.
Free Movement Mode
This mode allows Link to move about at will, floating through the air, submerging himself beneath the ground, and passing through obstacles. All commands are for Controller 1.
D-Up: Activates and deactivates free movement mode C Buttons: Moves Link forwards, backwards, and sideways A: Moves Link down B: Moves Link up
Pressing L + D-Down on Controller 1 switches Link's current form. The order is Link --> Fierce Deity Link --> Goron --> Zora --> Deku.
At the pause menu, press L on Controller 1 to open the inventory debugger.
Various button combinations on Controller 1 can be used to access the memory viewer.
Press Start on Controller 3 to enable camera debug.
Press Start on Controller 4 to access the environmental tools.