Game #1, Sokoban, required a nice scrolling tilemap, of infinite size. I spent a couple of days getting that all up and running, so that it'll do for other games, too.
But today, Game #2, Surprise!, required a different type of map.

Game #2 needs a wraparound map, so you can move from one side to the other, and carry on in a continuous loop.
This means that as well as drawing tiles where they're meant to be, on the DS's 512x512 pixel Background Layer, I also have to draw tiles if they're off to the far left, or far right of the map, too. Oh, what fun! (Game #1 didn't want this, as it's be confusing, in Sokoban, to suddenly see the left of the map on the right hand side!!)

It took me about an hour of tweaking, and a whole lot of %'s to get things up and running, and.. Assuming that what the screen's showing me is the same as what's in it's memory (!) I can now get to work on Game #2.

Game #2 should be done by tomorrow, as I know exactly what's going into it, and it's not exactly the world's most complex game!