The open beta of Factor Crafter, the game that intuitively teaches prime factorization and related concepts to older kids, teens, or even adults. Fill up your almanac with Prime Gems and Composite Stones as you factor and multiply.
Features 20 levels, an almanac of 100 stones (incomplete), and Sandbox Mode.
Coming soon: Lowest Common Multiples and Greatest Common Factors (premium?)
Possible Future Stuff: Exponents, logarithms, X-stone