ruby_snake

Snake game on ruby

Snake's movement is
[0, 1][0, 2][0, 3][0, 4]............
....................................
then it's
......[0, 2][0, 3][0, 4]............
..................[1, 4]............
and then it's
............[0, 3][0, 4]............
..................[1, 4][1, 5]......

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