Change all the floor tiles to blue

From Thread 1

It takes a bit of work, but you manage to convert all the floor tiles in the room to blue. The moment you finish, the room begins to flood with water. In a matter of moments, you're lifted off the floor by the rapidly rising tide.

Do you:

• Swim for the door where you came in
• Swim for the door at the other side of the room
• Swim down to the floor and change the color of some tiles