From the developer: "The cards flash before your eyes and you must answer them as quickly as possible to get the fastest time. Your time is saved and you can then play again and try to beat it. Any number of players can have times recorded. Addition is enabled for free in the download and with the 'Standard' registration fee subtraction, multiplication, and division are enabled. An 'Administator' registration is also available which allows creation of new flash cards, flash card sets, groups of players, and is multi-user capable on a LAN. This is great for classroom and lab use, but other pricing arrangemenst are required for non-home use. Public, private, and cooperative home schools must contact Soft Strategies for pricing."