A trap for Sherlock

You are Sherlock Holmes and his team. You have been tracking the legendary criminal, Professor Moriarty, for a long time and have finally come to apprehend him in his secret haven. However, upon bursting inside, you discovered that you yourself fell into a trap. The apartment in which you found yourself is a bomb with a clock mechanism, capable of ruining an entire London block with deadly gas if you don't solve the riddles and complete the task! Moriarty would be offended if someone called him a ruthless killer, as this is not the case at all. He is giving you a fair chance to prevent disaster and save lives. You have exactly one hour left before the explosion, and the mad genius of the criminal world will be watching with pleasure... Good luck to you, friends of Sherlock!