The aim of LineIt is to earn points, as much as you can. You have to move gem through free cells on the board.

When 4 or more gems with same color will be connected in a row (horisontal, vertical or diagonal), these gems will be deleted from the board and you will earn points (4 points for 4 gems, 8 points for 5 gems, 16 points for 6 gems). New 3 gems appear every time you move any gem. Game over when there are no place for new 3 gems.