Three-7

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This is Three-7, a falling block game where the goal is to make sure that the numbers line up and add up to seven, so they get deleted. The only way to get rid of sevens is by lining up three of them. 

There is also a second game mode where you need to line up three of the same numbers to delete them.

Controls: 

W (Z) :  rotate

A(Q):  left

D:  right

S:  down

Space: hard-drop

(Based on a game featured in Yu-Yu Hakusho)