256 Pixels Under the Sea

You are a diver in a submarine.

You have 1 minute to grab as much loot from the ocean on your round trip (down and back). You can control the sub's lateral movements with 'a' and 'd' but the sub sinks and rises at a fixed rate (you can press 'space' to give your self a boost if you get stuck). You use 'q' to switch you descent to ascent.

Treasure is found in chests and collected by diver. The diver is deployed from the submarine with 'w' and re-enters with 'e' (provided he has made it back to the sub). The sub is stationary while the diver is in the water. The diver has 10 seconds of oxygen outside the sub to retrieve treasure, and will die if he does not get back in time :(

You can control the diver's lateral and vertical movements with the 'arrow keys'.

On difficulties medium and hard, the sub takes damage when colliding with the coral and so will die if you hit too many.