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I dont recall l3 or r3 doing anything and I have almost finished it. You can use the stick instead of the d pad to move tour character, though I personally have always preferred playing any game that lacks degrees of movement with the pad. Feels more natural to me.
I got so far in the game with my broken d-pad. Stuck on Trial of the Fool. I actually deleted the game because of Nightmare King Grimm but redownloaded it a week later and won on the same day I redownloaded. Simply because I don't have anything to play.