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Here's a great game that you can make and then play with a friend. It's called Snake Pits.
To make "Snake Pits"
You'll need:
To play "Snake Pits":
You'll need:
How to play:
You can make the game a little bit different by:
The game uses a 3x3 square board. 2 players take turns to play, either placing a red on an empty square, or changing a red to orange, or orange to green. The player who forms 3 of 1 colour in a line wins.
Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots and a little about prime knots, crossing numbers and knot arithmetic.