Clean, defined colors with no "dirty" pixels (pixels that are a slightly different shade due to anti-aliasing).
Finding the best repositories to
+-----------------------------------------------------------+ | [Row 1: Idle Animations] (Blinking, tapping foot, waiting)| +-----------------------------------------------------------+ | [Row 2: Basic Movement] (Walking, jogging, full running) | +-----------------------------------------------------------+ | [Row 3: Physics Actions] (Jumping, rolling, spin-dashing) | +-----------------------------------------------------------+ | [Row 4: Combat/Damage] (Taking hit, recoiling, dying) | +-----------------------------------------------------------+ Key Technical Criteria sonic sprite sheet