As in the case of Add-up surprises,
This task was designed as part of the Number sequences strand of the WebLabs
project. Simillarly, this game was is positioned as a puzzle game or riddle, and can be used in various manners. In this case, the challenge is to re-program on of the two robots in a chain (Add-a-num and Add-up) to produce the factorial sequence.
Apart from the modes of use mentioned in the case of Add-up surprises, this task can also be used as a leader into the guess my robot game, which constitutes the main theme of the next segment.