AS refer to Add and Sub. During the game process, the card present as Arrow.
Game Rule:
Delete all card to win. User can drag and drop card from cards library to original
6 cards. At the game start, original 6 cards look like:
d
-b
e- a
-c
f
User can connect d, e, f cards. Once d and e are deleted, user can connect to b.
Cards are positive for a, b, c, d, e, f. And then connecting card is negative.
In the similar way, the next card is positive (add/plus), and then the card is negative...