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When I bought the game, the descriptions of the two version were pretty clear that db+ was the same levels as db but with more bonus levels. Maybe they've updated that since you bought.

I got db+ and was happy to see that the bonus levels progressed from symbols to letters/numbers so the last levels looked exactly like the algebra my kids will see in school. I think the game did an excellent job transitioning from the early levels that looked like many other kinds of puzzle/pattern games but evolved the symbols into more typical algebra equations in a way the kids barely notice but suddenly they're doing equations just like their math class. Very well designed IMO.

I've had my 7yr old working them on the white board. He had a blast with it. Has all 600 stars now and would probably play more.

We need more imaginative games like this!

Thanks for this report. My kid loves math, and so I bet he'll love this (he's six as well).