The Collapsing Tomb is a Diablo 3 quest first played in the BlizzCon 2009 demo build. The quest puts players in a treasure room style dungeon that will collapse in 4 minutes, killing any players who remain inside it after that time. Players must find the exit before then or die, while fighting off monsters and retrieving as much loot as possible from the numerous super chests that stock the dungeon.Players began this quest by entering a portal on the desert surface level, The Howling Plateau. Once through the portal players appeared in a desert tomb style dungeon. A timer reading 4:00 was visible on the screen, and it began counting down at once. Each character who entered the tomb cried out a warning as soon as he/she arrived, "This place is falling apart. I've got to get out of here!"The Timed QuestThe timer started as soon as any player entered. If other players came in a moment later, they did not get a fresh 4:00; just whatever was left of the initial 4 minutes. It would obviously be a wise idea to synchronize the entrances of multiple players, so everyone would start at once. To reinforce the imminent danger of collapse, the dungeon shakes constantly, with large rocks falling from the ceiling (they knocked back and damaged players or monsters they landed on) and the screen shaking with their impacts.Players who died in the dungeon collapse reappeared at the last checkpoint, on the desert surface near the dungeon entrance. It was not possible to re-enter the dungeon after the collapse, but players did keep all of the loot they'd found while in it.SuccessPlayers who found the exit portal in time reappeared on the surface near the portal they'd entered through. In addition to all of the loot they'd picked up, they received 7995 experience as a bonus. This was a considerable amount at level 14~; individual monsters inside the tomb and on the desert surface were worth 50-100 each, at that level. Once back on the surface in the Blizzcon build, the countdown clock remained visible, finally vanishing when it got to 0, when a "The tomb collapses." message appeared. Though no multiplayer reports have been seen, it's assumed that the timer continues so players who get out can remain notified about the progress of others in their party.