Dig It
Dig It is subtraction as gameplay: the ball needs to reach the goal, the ground is in the way, and your finger carves the tunnel. Gravity does the driving; you do the civil engineering.
Each level's terrain hides its own physics joke — dig too steep and the ball overshoots, too shallow and it naps mid-tunnel.
Tip: dig the end of the path first, then connect backward — finished exits let the ball's momentum be your final calculation, not your gamble. More one-finger physics at skill games.