Instead of having to set the Pixels Per Unit to 31 and causing some tile overlapping, set the Filter Mode for the sprite sheet to “Point (no filter)” as this will prevent anti-aliasing from creating those gaps and will help the pixel art retain its sharp edges as well.
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Thanks! This tip works great, even better than using a Sprite Atlas (sprite atlas is recommended by Code Monkey). The Rick method of reducing pixel per unit to 31 is ok but creates messy overlap between sprites, which is probably not what we want.