Creative Maps! - What YOU Want to See!

[The chaser]

In my story, water is a pretty common thing in certain areas, and I have planned lots of things for it... I'm even trying to apply a swimming system (not working as I would like).

I have thought about a room that gets filled slowly with water, and it's only at the final, when the room is pretty much filled, that a key floats from a vent (because of the water pushing it up), for example.