This was the first adventure that appeared in Transformice to have event items appear outside event maps, and to feature shops where you could choose what to purchase.
Sometimes a map will have a randomly placed event item in it which can be collected to by the mouse purchase items from one of the four mice in the event map. Once the mouse collects the item on the map, the corresponding event item will appear on your back and will turn ghostly where you collected it on the map, indicating that you have already collect the item. The item can't be obtained until the mouse bring the cheese back to the hole. You can spend these currencies on the event map in the shop listed below.
Five seconds have to pass before you can collect the event item on a map. If you are revived by a shaman using the Ambulanceskill after collecting an event item, you will still have the item when you respawn, negating the need to collect it again, despite the fact it no longer appears on your back.
On 11 April 2019, Easter eggs were added on maps, and Oracle was added to the event map shop. Easter eggs are able to be traded. They were both removed on 25 April 2019 alongside the St. Patrick's Day 2019 event. The eggs also appeared in last year's St. Patrick's event.