Our six year-old really took to Mystery Math Town, a maths-based iPad game that came out earlier this year, then later got squeezed down for iPhone.

Now developer Artgig Studio has released a sequel: Mystery Math Museum. The idea remains the same: a game that gets children to explore rooms and collect dragonflies by solving sums.

This time, they’re doing it in eight museums rather than houses: each one with a different theme from sports and Wild West to ancient history and music.

As your child works through the game, they unlock talking portraits to hang in a virtual gallery, which is a nice symbol of progression. You can also create multiple accounts in the app, if you have different children.

Artgig is also big on the way children “build equations” by dragging numbers into place in the game, rather than simply tapping on numbers to solve pre-made sums.

Addition, subtraction, multiplication and division are all included again, along with “varied number representations” like dice and tally marks, to mix things up. You can customise which kinds of sums and what difficulty level in a menu, to suit your child’s abilities – it’s aimed at 6-12 year-olds, which is a wide spread, so that’s a useful feature.

Mystery Math Museum costs £1.99 for iPad on Apple’s App Store. Here’s a video demo: