Good evening, Ladies and Gentlemen. Let me introduce myself - you may call me Zero.

You may have noticed something different when you woke up today. Perhaps the cellphone strapped to your wrist that you couldn't get off, or the strange room in which you awoke. What I suspect you didn't notice, is the small explosive capsule resting gently against the lining of your bowels. Don't be alarmed - it won't go off... so long as you obey the rules.

In nine hours, the gas canisters I have placed in the ventilation system will activate, and you will fall unconscious, and lose your memory. We will repeat this game until someone wins. Maybe you've already played? Perhaps even more than once. And you'll keep on playing, until the game has been won.

But how do you win? Escape this place. Around you, you will see numbered doors. Somewhere behind those numbered doors lie more numbered doors. Look for the door that bears a '9' to find the exit. Find the exit, and you win the game.

Like any game though, this game has rules. To pass safely through a numbered door, you must first unlock it. Unlocking a door is done by messaging me with the number of the door you are unlocking. A minimum of three people are required to unlock a door, but no more than five people can unlock it at once. As soon as you receive my confirmation that the door has been unlocked, you will have 18 seconds to pass through the door before it will lock again.

When you pass through the door - regardless of whether you were involved in unlocking it - the detonator inside your cellphone will activate and begin its countdown. You will have 81 seconds to find the deactivation code on the other side. Everyone who unlocked the door must send this code to me, and your detonators will be deactivated and reset.

The only detonators that will be deactivated will be those that belonged to the unlockers, and only once they have all checked in. If you pass through a door without taking part in unlocking it... well. The results will be... unpleasant, as you can imagine. If you unlock a door, but do not pass through it, your detonator will not activate - but if other unlockers pass through that door, they will not be able to deactivate their detonators without you. There is no penalty for unlocking a door so long as no one passes through it.

We have gone through the physical process of unlocking numbered doors - but there is slightly more to it than that. You will notice there is a number on the screen of your cellphone. Those who want to activate a door must have numbers that combine to a root number that is the same as that on the door they wish to open.

To find the root number, add your numbers together, then add the individual digits together so you have a single digit number. For example, numbers [4], [5] and [8] added together - 4+5+8= 17, then 1+7 = 8, so [8] is the root number of [4], [5] and [8].

Those are the only rules. And before you waste your time trying - all chimneys have been blocked, and the windows have been replaced with bulletproof glass.

So what are you waiting for? Time is ticking.