This month's Plus puzzle is Cushion Ball.

You can find this together with all this month's other puzzles for ages 15+ at the 15+ Challenges page at NRICH.

To send in your solution, use one of the methods described on the NRICH Problem Page.

Recent NRICH Puzzles

More Challenging Problems from last month.
More Challenging Problems from 2 months ago.
More Challenging Problems from 3 months ago.