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Focusing on systems that perform tasks automatically, this category includes games where players design, build, and manage processes to achieve specific outcomes.

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.

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

Games that can be played alone

Resources for building and relating to User Interfaces, how the user interacts with your program