The sparse light from his lantern shows a staircase leading down into the depths. Beside him lie a backpack, a spade, and a phone whose cord follows the stairs into the darkness. "Get out of here. Get out of here. Put the record on it and Hau Ab!" booms panic-stricken from the receiver. "I won't let you down, Harley," he says in a shaky voice. As he does so, his eyes wander to the heavy gravestone slab pushed aside, "Do you hear me, Harley?" he yells. A crackle of the phone gives him pause. A muffled, rapt, gelatinous voice pours out, "Harley's dead, you fool." The man begins to laugh hysterically. Protecting his own mind, his heart fails and he falls lifeless to the floor. Forbidden Knowledge is another title in the innovative Undo game series. This time, players are transported into the fantastic world of H.P. Lovecraft. Together they decide in which order to travel back to different points in time in the victim's life. In this way, they gradually explore a touching story about poverty, grief and family, which completely captivates the players without giving away all the secrets.