Maths Rich Task

Our challenge was to work in groups and decide together which domino we would put forward for testing to the rule.  It was really tricky to start with but with practice we are getting better at it.  The objective of the game is to have as many rules discovered with the least amount of dominoes tested.  
An example of a rule is:

There are twice as many spots on one half as the other.

Here is the link if you would like to try it at home.

https://nrich.maths.org/9926