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

Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

Typically shoot em' up games where the emphasis is dodging a large number of bullets on the screen at once. Bullets form dense patterns on the screen that require precise controls to avoid.

Products that involve or comprise source code, including programming games; does not refer to products with their own source code available, open source or not.