Cool Multiplication Video Game

I came across this multiplication video game called "Timez Attack" via a math blog I follow. There's a free-bee version and a paid version. I've only seen the free one but it's cool! Your character has to escape the dungeon by opening doors and defeating the ogre behind each one. The only way to defeat him is to answer multiplication problems -- if you answer too slowly or incorrectly, he gains strength; if you answer correctly he loses strength until eventually he keels over and you can steal his key to open the next door. Isaac thought it was very cool! This is a high-quality game -- excellent 3D graphics. Anyone familiar with Bugdom? It looks that good. Here's the link for those who may want to download it.

http://www.bigbrainz.com/