SystemFreak is a card-game.
SystemFreak is a (atm. singleplayer) cardgame. The computer places one or more card(s) on the table, and deals you eight cards. It then thinks of a system that dictates what cards you can play according to what cards are on the table. Your goal is to figure out what the system is.
To figure out the system, you try to play cards. By noticing what cards are allowed at any given time, you should be able to deduce what the system is. When you think you have figured out the system, and cannot play any of your cards, you can hand them all in to the computer.
If you were right, you get new cards, but two fewer than you handed in. If you were wrong, you get your cards back, along with two extra cards. The goal is to get rid of your cards, preferably because you figured out the system.
What is really cool is that you can write you own systems as well!