In the game, your character is an alien girl or guy and you move though the levels by fighting the bad guys off by answering multiplication problems. The basic "dungeon" map is free and you can actually play all the way up thorough 12s on that map. They also have other levels that you can purchase with different backdrops and different bad guys to help keep things interesting. I made a deal with my son (who absolutely loves the game) that I would buy him the next level when he reached a certain point in the game. It was great incentive for him to keep working.
It gives kids a limited time to answer the questions and it is really good about showing the answer to a missed problem and then repeating the problem until they get it correct. The game gets kids to practice like they are doing flashcards but makes it fun and keeps them interested. With this game, my kids (ages 8 and 10) have been doing a great job with his times tables and have been having a great time playing. I love it when they are practically begging to play an educational game!