D-Box is a puzzle app game, whose objective is to score points. Your task is to move the squares 1 at a time to form a line of 5. When that happens, you score points and they disappear. After every turn, 3 new squares enter the board randomly.
I played this a few times. My high score is 119 - not so great.
D-Box is similar to a lot of other games. Bee Cells comes to mind.
If you have not played a game like this, you can't go wrong with D-Box.