"Greetings...and welcome. I trust that you are all wondering where you are. I can assure you that while your location is not important, what these walls offer you is important: salvation, if you earn it. Three hours from now, the door to this house will open. Unfortunately, you only have two hours to live. Right now, you are breathing in a deadly nerve agent. You've been breathing it since you arrived here. Those of you familiar with the Tokyo subway attacks will know its devastating effects on the human body. The only way to overcome it and walk out that door is to find an antidote. Several are hidden around this house. One is inside the safe in front of you. You all possess the combination to the safe. Think hard. The numbers are in the back of your mind. The clue to their order can be found over the rainbow. Once you realize what you all have in common, you will gain a better understanding of why you're here. X marks the spot for that clue, so look carefully. Let the game begin."