There are four simple rules that you need to know to solve any Goal set in On-Sets:
1) If the Goal-Setter places only one cube on the Goal section of the playing mat, then the Goal is equal to that number. With this sample Goal, players simply need to name 5 cards.
2) When cubes are placed side by side in the Goal, use addition to find its value.
3) Putting cubes on top of each other in the Goal means you multiply the numbers together to solve the Goal.
4) If a cube is turned upside down, then it represents the negative of that value.
There are three digit cubes that can be used in the Goal. Besides placing all the cubes side by side or on top each other, there are two acceptable configurations that can be made in the Goal–the “L” shape and the upside-down “T”. Follow rules 2 through 4 to find the value of the Goal in these configurations.
One final note, if any player sets a Goal that is negative, more than the number of cards dealt (except with Double Set in Jr & Sr) or in an unacceptable configuration, then you should challenge Never against the Goal-Setter.