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Slither is the classic snake game in HTML5. However, this version has some crazy twists, including upgrades, extra levels, poisons, moving enemies, and other cool abilities. As with the old-school version, be sure not to run into the walls or yourself (as your snake keeps growing longer). You start with three lives, but have the ability to gain extra lives by collecting upgrades.
Detailed instructions/explanation here: http://www.brokenresolve.com/2010/05/slither-game/
Author: Erik Johnson