Ground Cancel Jump
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A ground cancel jump, also known as a 3 frame jump, is a jump that keeps Jak in an airborne state.
Ground cancel jumps are used to store fall damage and to initiate the infinite bounces needed for the current method of Fire Canyon Skip.
Technical
When Jak lands back on the ground from a jump or from loading a save file, it takes 3 frames of being grounded for the game to register Jak as not ariborne, or as grounded. By jumping during this 3 frame window, Jak will remain in an airborne state. These jumps can be chained to move Jak around in a non-grounded state.
Discovery
The ground cancel jump was discovered by Kuitar.
Video Demonstrations