An end-of-unit group activity to assess and challenge knowledge and understanding of probability. Four differentiated levels of questions about all different types of probability and an answer booklet linked directly to the questions. I printed each different level (Bronze, Silver, Gold, Killer) on a different colour card, cut them up into individual challenge cards and have laminated them. I create mixed ability groups and each group gets all the questions in four piles. The group work through the questions in any order and are encouraged to stretch themselves with which level of challenge they are attempting. Questions taken from all over the place to create this resource. Good for KS4 classes or HA Y9.