A sample level of the Series Game. It would show you numbers of a sequence and then you had to come up with a formula that represented the series. You had two variables x and p. x was the current index, and p was the previous value. Powered by the NCalc system, you could write complex formulas for the game.

If your formula did not work, the game would have rendered the expected vs real for you to see where the problem is arising from.