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The Labyrinth "minigame" is laggy for you too, huh? Word of advice, be patient and pay attention to the button you click before moving again. Since it lights up when you click it, you can use that to your advantage and wait for it to load if it's already lit up. (Should probably note I play the game on mobile)

Also, if you wanna grind levels, Mimics are gonna grant you more Exp than anything else. Just spam Seduction on them, since Mimics will always be an equal level to yourself, it's better to play it safe with them. Once you get past the Labyrinth, you'll be able to "Explore" the Labyrinth, and that's gonna be your level grinding spot after that point, since turning on Nightmare Mode when exploring there makes every enemy equal level to you, just like those Mimics you would grind beforehand.

There's no good reason to farm minotaurs... If you ask literally anywhere ppl will tell you the best things to farm are mimic and nightmare labyrinth(when capable) you can save scum through most of the labyrinth which will help with your lack of patience being able to undo movements you made by accident 

In the labyrinth minigame, you don't need to use the arrow keys, you could just click on the tile you want to move to, bearing in mind the fact it has to be a tile next to the player icon and diagonal movement isn't a thing you can do.

Small catch, if you click on your current tile, you won't move but everyone else will.