Card Blitz 21

Collect 21 points in 4 stacks simultaneously. For 3-assembled combinations receive 1 point, the subsequent three combinations bring you 2 points each, and so forth: 2 to 3, 2, 5, 7, 10, 25, 50, 75, 250, 500 and 1000 points. Interrupting the winning streak, start collecting points with 1 point. Do not worry, no pants out of this game still has not left. Good luck!