Problems
A Shapely Network
Stage: 2 Challenge Level: 
Your challenge is to find the longest way through the network following this rule. You can start and finish anywhere, and with any shape, as long as you follow the correct order.
Snails' Trails
Stage: 2 Challenge Level:
Alice and Brian are snails who live on a wall and can only travel along the cracks. Alice wants to go to see Brian. How far is the shortest route along the cracks? Is there more than one way to go?
A Dotty Problem
Stage: 2 Challenge Level:
Starting with the number 180, take away 9 again and again, joining up the dots as you go. Watch out - don't join all the dots!
World of Tan 26 - Old Chestnut
Stage: 2 Challenge Level:
Can you fit the tangram pieces into the outline of this brazier for roasting chestnuts?
Path to the Stars
Stage: 2 Challenge Level:
Is it possible to draw a 5-pointed star without taking your pencil off the paper? Is it possible to draw a 6-pointed star in the same way without taking your pen off?
Home Time
Stage: 2 Challenge Level:
Alice's mum needs to go to each child's house just once and then back home again. How many different routes are there? Use the information to find out how long each road is on the route she took.
Child's Play
Stage: 2 Challenge Level:
A toy has a regular tetrahedron, a cube and a base with triangular and square hollows. If you fit a shape into the correct hollow a bell rings. How many times does the bell ring in a complete game?
Watch Your Feet
Stage: 2 Challenge Level:
I like to walk along the cracks of the paving stones, but not the outside edge of the path itself. How many different routes can you find for me to take?
Palindromic Date
Stage: 2 Challenge Level:
What is the date in February 2002 where the 8 digits are palindromic if the date is written in the British way?
LOGO Challenge 9 - Overlapping Polygons
Stage: 2, 3 and 4 Challenge Level:
This LOGO challenge starts by looking at 10-sided polygons then generalises the findings to any polygon, putting particular emphasis on external angles
Have You Got It?
Stage: 3 Challenge Level:
Can you explain the strategy for winning this game with any target?
Getting an Angle
Stage: 3 Challenge Level:
How can you make an angle of 60 degrees by folding a sheet of paper twice?
Poly-puzzle
Stage: 3 Challenge Level:
This rectangle is cut into five pieces which fit exactly into a triangular outline and also into a square outline where the triangle, the rectangle and the square have equal areas.
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NRICH is part of the family of activities in the Millennium Mathematics Project.