Easy | Medium | Hard | Extreme |

Replace the "?" with the next number in the sequence.

A Collection

Easy | Medium | Hard | Extreme |

There are 12 matchsticks in the top row, the bottom row, the left column and the right column as shown above.

Your challenge is to TAKE AWAY 4 matchsticks and rearrange the remaining matchsticks to still leave you with 12 matchsticks in the top- and bottom rows as well as the left- and right columns.

All matchsticks must be flat on the surface and no matchsticks may be broken.

TAKE AWAY 4 matchsticks in the middle row. Move one matchstick to each corner as shown with the arrows.

Easy | Medium | Hard | Extreme |

Shown above are 5 equal triangles formed with 15 matchsticks. Note how the triangles are placed exactly in the middle of an adjacent triangle.

Move 3 matchsticks to form 10 triangles. The rules are:

- All matchsticks must be flat on the surface

- No matchstick may be broken

- The full length of each matchstick must form part of a triangle

- 6 of the 10 triangles must be equal in size.

Easy | Medium | Hard | Extreme |

Shown above is a six sided convex polygon built from 1 square and 2 triangles. 8 matchsticks were used to achieve this. The outside angles are all greater than 180 degrees as illustrated with angle "a" above.

Create your own convex polygon. The following rules apply:

1. Polygon to have 7 sides

2. 12 matchsticks to be used

3. All outside angles to be greater than 180 degrees

4. There must be 3 equal sized triangles

5. There must be 2 equal sized squares

6. All matchsticks to be flat on the surface.

Easy | Medium | Hard | Extreme |

Place 6 broken matchsticks (2 with heads and 4 without heads) as shown in the figure left above. The challenge is to move the broken matchsticks and to end as shown in the figure right. Only 1 broken matchstick may be in a square when moving.

Can you achieve this in only 9 moves?

The following is 1 solution:

E to C

F to A

C to F

D to C

H to B

I to D

F to I

G to F

I to E

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