Gels often come in varied colours and flavours. Red and green gels are commonplace.
Another more recient example of 'Gel' within a game is of a different cast. This is of course the recient addition to the Valve stable of Portal 2. Here the Gel is used not as a consumable but as a reactive substance. The Gel design (brought about by Digipen students) alters the environmental state of surfaces in the game and gives a broader range of difficulty to the test chambers and puzzles of the game. The Gel's are split into three types: Repulsion and Propulsion are the two original Tag Gel's changing the movement of the player; while the third White colour Gel changes the portal properties of surfaces itself.
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