You were walking along the Snake Canyon and, seeing some cave, entered it. After a few steps, you realized that you were lost. How to be? There are two tunnels in front of you: one goes down and the other goes up. Suddenly it dawns on you that the first tunnel will lead you to the past, and the second to the future. You have long dreamed of such trips, but you don’t yet know which one to choose. In any case, be careful: a giant reptile is as dangerous for you as an interplanetary spaceship.