I rediscovered an old pack of Marvel Top Trump cards the other day and tried them out with BigG (4). They were a hit!! It helped that he’s a huge Marvel fan. We omitted the first two categories which were the character creation year (1967 etc) and number of appearances (usually in the 1000s!) but the other four categories were simple enough for him to grasp and it was a fantastic tool to get him enthusiastically reading numbers from 0 to 100 and working out which number is bigger.
I’ve just ordered another set from Amazon and predict ordering lots more!