I Wonder... What If...?

Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?

When is it impossible to make number sandwiches?

Shogi tiles can form interesting shapes and patterns... I wonder whether they fit together to make a ring?

How did the the rotation robot make these patterns?

Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?

Read about the problem that tickled Euler's curiosity and led to a new branch of mathematics!