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When jumping over obstacles is one of the main actions, challenges, or mechanics of the game.

Typically small graphics that can be used to represent something, like items or actions

Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.

For that old school look and feel.