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

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.

Bones and stuff

Sprites are generally 2D images used in games to represent objects. They can be animated or static, and come in different styles like isometric or top-down.