To unlock up to seven free games and activate the Free Games Feature, look to unlock three Mighty Rabbit Boxes. Plus, if you manage to unlock any additional Mystery Rabbit Boxes, each one will dish out an extra three free games, as well as increasing the multiplier by one for all wins that occur from that point onwards. This also applies during the Free Games Feature. So, what does the Mystery Rabbit Box look like? Well, as you can imagine, it's a wooden box with two white rabbits peeking out of the top of it.