Basic Rules

Equations
Only unary minus with non-zero number is allowed.
-6 = 4 - 10
+7 = 5 + 2
Only 3 digits can be concatenated.
-123 = 100 + 23
-1234 = 1000 + 234
Zero left padding is not a valid value.
012 = 011 + 1
Points
There are four types of multiplier.
x2 for piece
x3 for piece
x2 for equation
x3 for equation
Succesfully submitting all 8 items will gain +40 extra points.
End game
There are two ways of ending game.
1. Ran out of both common items in the bag and one's deck items.
2. Continually passed the game 3 times. A pass button only appears when there is no items left in the bag.