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heeyaaa, im sorry if i didnt understand the concept well because english isnt my first language but is there really no other way than whistling ? 
because i never learned how to..and i do not know how to, should i just try to find a way to whistle or find one of those things that whistle or is there another way like...singing ? something else, can we use instrument ?
ive been trying to get the notes right with my broken whistling that sounds like wind going through a dead tree but i cant seem to get any of them despite trying over and over again, its ok if theres no other way, the game was made on whistleling (ig because im trying to play before watching anything related to the game), anyway, thanks for reading that far and i really hope ill be able to play '~_~ (if anyone has a "whistle trick" please help me T-T)