Based on the novel of the same name. The Mice are trapped in the sewers under the serpentarium, and must escape by rescuing as many mice as possible, but among them there is a traitor, if the traitor leaves the first, he will close the exit trapping them. Each turn the active player take a tile and place it as part of the sewer, can move up to 2 spaces and resolve an event card. The tiles allow you to draw item cards or rescue mice. the events will indicate when to remove the sewer covers, when the 4th is removing, the mice will be able to get out. If the traitor mouse comes out first, he wins. If at least 1 brave mouse manages to leave before, when the traitor mouse leaves, the rescued mice will be counted on each side and the one with the most will win.