TetradG 30

We aren't allowed to call this a tetris, but that's what it is. Clear 4 lines at once. It takes a minute to get used to, but build same as you normally do in tetris with a slot for the 4x1 to drop. Personally it looks to me like when a specific type of piece drops, you will get a few of them so the only luck is will it come down on the side of the board you need.