I thought just having a submarine move through different mazes would be kind of, well, monotonous. So I decided to spice things up with moveable walls.

Every six seconds, the two squares shaded light gray will move down to the other empty space below it. And then it will do that over and over again. This took a long time to do.

Apparently I couldn't rewrite the values of the map data, so I had to make two separate groups of map data that change. But I also did something else I like: I think I finally got rid of the stalling note on the title screen that sometimes occurs when it switches from the game back to the title screen. One thing I do find odd is that apparently it knows when a bank is 99% used and it will go to the another bank and start using it? At least it works.