Sorry Kriston I misread your original post. I thought that you were saying that your kids didn't like it.
Well, IMO, $40 was a steep price for it. The two other levels are pretty neat and there is a *wow* factor particularly with the robot level. DS sort of knew his times table already, but this is doing a pretty good job reinforcing the facts to the point where before playing he races up to his room to his times chart to "review" before the game. You can hear him shout all the way downstairs! "5! 10! 15!...."
For us it was worth it. I think it's better than a lot of the games out there that are all flash/action with no real focus on the learning part.
Cathy, no problems with the full version, but I didn't have any problem with the free version either. If you email tech support they do get back to you. (DS loved it so much I was asking for ALL operators!) PM if you want. I doubt I'll be much help, but I do know a thing or two about 'puters.
JB