I've been looking for a decent algebra app to pass a college math placement exam, and I was worried this would be too simple or juvenile. It's actually brilliant, especially if you're a visual person that hates math. This doesn't FEEL like math, but it's gradually getting you to solve for x with more and more complex equations. Don't let the kiddie interface fool you, I'm 34 and still learning a ton from this app without it feeling like a jumble of numbers or a chore.