### Traffic Lights

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.

### Achi

This game for two players comes from Ghana. However, stones that were marked for this game in the third century AD have been found near Hadrian's Wall in Northern England.

### Yih or Luk Tsut K'i or Three Men's Morris

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.

# Got It

##### Stage: 2 and 3 Challenge Level:

Try to work out the 'stepping stones' that you must 'land on' on your way to the target?

Alter the settings on the game to have a lower target and a shorter range of numbers (e.g. a target of $10$ using the numbers $1$ and $2$). As you play, note down the running totals to refer back to later.