disclaimer: should you do this? no

this may very mess up your game and corrupt your save, or not, i dont know, and that doesn't make this safe. (this is also unrelated to my bug report i messed with the soundtrack after that crash.)

the process is very simple. in folder with the application file there are several music files, find the one you want to replace and move it somwhere safe, now replace the file with another piece of music, with the same name and file type the game only seems to play files in the format of ".ogg" so if its not in that format you will either have to convert the file, find a .ogg version or choose a different song.

have fun replacing the relaxing puzzle music with stuff like "donacdum" and "one winged angel", or maybe something else you like that you find relaxing, just make sure you don't break your game. and backup your saves i guess.

this wont mess up your save file in any way

this makes no sense, like, to break the game , you need to change data.win/the exe/your save file, but changing a single .ogg doesnt mess it up at all, the game might crash if it doesnt find the ogg called for at x level/the game was AAA and you couldnt change the files

i just put down the "may break your game" due to the fact that after i did this i got three consecutive crashes. so i think a disclaimer was reasonable.