A drop of water. That's what started it all. You thought it was just because of the rain outside. So you asked your friend if the rain is very heavy. It turns out that the sun is brightly shining. Then you went back to work. The water level was rising with every minute. You started to worry. The puddle rose up to your ankles. And it rose higher to your knees. So you started on your way out. You reached the door but it was locked. You tried with all your might but to no avail. The only way out is to solve the puzzles around the place.