Do you have a bright kid in the 7-11 age group, and want to give them a challenge - as an alternative to computer games, perhaps?

This listing is for one or more of the books in the 'Boost Your Brainpower series. Select all four or the book(s) of your choice from the drop down menu.

Each option shows the cover and one of the internal pages.

If you want to purchase 2 or three books, it is a bit messy because the cart can't combine shipping. So purchase the books separately and if you pay with Ping, the excess whipping will be refunded.

If you want to pay by internet deposit, wait till I confirm the total to pay.

• shop with COSIMO with confidence ++

COSIMO is the Trade Me trading name for Kiwi Books

Your first stop for New Zealand and children's books, both new and ex-display

We also sell quality non-book items at exceptional prices.

Combining purchases, to give you delivery savings when possible, is standard practice. But not all products can be combined easily or shipped for the price of one - so it pays to check first.

AUSMATE – I ship to Australia, but please use Q+A to ask for a postage rate for you before bidding or taking a buy now.