... is negative
(subtract/minus). The row of cards can be deleted as sum (add/subtract) of cards is 0. (J is 11,Q is 12, K is 13)
If the number of cards is 12, but can't be deleted now.
The game is over. By the way, if cards library is empty and user can't win,
the game is over.
Note:
1. Click "NEW GAME!" can start a new game.
2. Click cheat image (NOT text), can ON/OFF cheat information. Cheat is ON by default.
But I suggest OFF, to play real AS Arrow.