I draw the sprite in the built in sprite editor and it looks crisp and good. But in game it just gets blurred to bits.
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On your project properties, set filtering to Point instead of Linear. Also, depending on the type of game, pixel-rounding to On may help so you don't get sub-pixel movement.
what is the size of the sprite?
check your game's resolution as well.. it may be "zooming in", and the image might be really small.