Junior monopoly is a similar premise to the adult one with simplified rules. It is based on amusement park rides and attractions. Buying and paying to use. She wouldn't be able to work out the sums herself but DS plays with DD1 and I (and he's 3.5) and we just work it out for him. We ask him what he wants to do and if he wants to buy it. He loves it. There's also one with an ATM but that's a bit more complex, though DD1 was able to play at 5.