拥有特殊技能与极速汽车的动物英雄们共同守护大树城，一起解决城里最棘手的种种问题。

Andy works at a museum and has the use of a time machine to go back to prehistoric times to collect feathers, bones, dung or whatever else is needed in prehistoric displays for his museum. With the help of the contents of his backpack he manages to keep himself safe and get back to the museum.

作为不起眼的看守者，你将置身于一场冒险，屋顶上的神秘人打扰了你。谁在那？追逐随即开始，一个又一个房间……不停上上下下……奇怪的是，你差点就能看到他。但这个难以捉摸的陌生人总是领先一步，只留下一路的礼物……