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Stop or Dare


Snail Trails

This is a game for two players. You will need some small-square grid paper, a die and two felt-tip pens or highlighters. Players take turns to roll the die, then move that number of squares in a straight line. Move only vertically (up/down) or horizontally (across), never diagonally. You can cross over the other player's trails. You can trace over the top of the other player's trails. You can cross over a single trail of your own, but can never cross a pair of your trails (side-by-side) or trace over your own trail. To win, you must roll the exact number needed to finish in the target square. You can never pass through the target square. The game ends when a player ends his/her trail in the target square, OR when a player cannot move without breaking any of the rules.

Game of PIG - Sixes


Odds and Evens

Age 11 to 14
Challenge Level

Here is a set of numbered balls used for a game:


To play the game, the balls are mixed up and two balls are randomly picked out together. For example:

one ball numbered 4 and one ball numbered 5

The numbers on the balls are added together: $4 + 5 = 9$

If the total is even, you win.
If the total is odd, you lose.
How can you decide whether the game is fair?

You might like to experiment with the interactivity below.

Here are three more sets of balls:
 Set B: 1,3,5,6,7 Set C: 2,3,4,5,6,8 Set D 1,3,4,5,7,9

Which set would you choose to play with, to maximise your chances of winning?

Click on the links below to explore each set using the interactivity.
Set B
Set C
Set D

What proportion of the time would you expect to win each game?

You may wish to look at the problem Odds and Evens Made Fair to explore whether it is possible to change the number of balls to make the game fair.