Defuse

You are the Chief of Security in a major government building. You have just received a telephone message from a terrorist group claiming that they have planted a bomb somewhere in the building. Fortunately, you have the most sophisticated electronic detection equipment available. Your detector gives off a signal that gets stronger as you get closer to the bomb. However, the building is large— 100 stories high, 100 rooms long, and 100 rooms wide — and you are pressing a time limit of 200 seconds to find the bomb and defuse it.