This page describes code patches which can be applied to the disassembly to make various useful changes.
Remove Beginning Locks
When you begin a game, you cannot open the menu, and music does not play properly. Apply these changes to fix the issue without completing the intro normally.
A single flag named "GLOBALFLAG_INTRO_DONE" is responsible for these events. Run
git grep GLOBALFLAG_INTRO_DONE to see where it is used:
$ git grep GLOBALFLAG_INTRO_DONE code/ages/roomSpecificTileChanges.s: ld a,GLOBALFLAG_INTRO_DONE code/bank1.s: ld a, GLOBALFLAG_INTRO_DONE code/bank2.s: ld a,(wGlobalFlags+GLOBALFLAG_INTRO_DONE/8) code/bank2.s: bit GLOBALFLAG_INTRO_DONE&7,a code/seasons/roomGfxChanges.s: ld a,GLOBALFLAG_INTRO_DONE constants/globalFlags.s: GLOBALFLAG_INTRO_DONE db ; $0a: Once set, start/select are usable [...etc...]
It is used many times, but we only care about its usage in "bank1.s" and "bank2.s".
Find the following code in "bank1.s":
checkPlayRoomMusic: ld a, GLOBALFLAG_INTRO_DONE call checkGlobalFlag ret z
Simply delete these 3 lines of code (or comment them out with a semicolon) to enable music. (Don't delete the "checkPlayRoomMusic:" label, only the 3 lines below that.)
Then, find the following code in "bank2.s":
; Return if you haven't seen the opening cutscene yet ld a,(wGlobalFlags+GLOBALFLAG_INTRO_DONE/8) bit GLOBALFLAG_INTRO_DONE&7,a ld a, SND_ERROR jp z,playSound
Again, simply delete these 4 lines of code. This will allow you to open your inventory.