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Fruits give you one point and make you grow. In arcade gamemodes, they also make the game go faster
Holes kill you if the entire snake is over a hole, or the head and 3 subsequent tiles are over a hole
Fire kills you if you touch it
+ Oil is flammable and will periodically catch on fire, which will kill you. It is otherwise perfectly safe
Super fruits give you 10 points, and sometimes spawn in arcade mode
Decaying fruits give you 5 points and sometimes spawn in arcade mode, but they also decay after 2 seconds and disappear