AS refer to Add and Sub. During the game process, the card present as Arrow.
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.