Use Turbo Mode for best results. Uh... I'll explain the weird numbers. The list order determines the rendering order, where 1 renders first. Digits 1, 12, 13, 14, and 15 don't matter... yet. Digits 2 and 3 determine the tile number. (You can change the tiles in the Costumes menu!) Digits 4 and 5 determine the X position, while 6 and 7 determine the Y position. The positioning goes from left to right, top to bottom, starting in the top-left corner. Digits 8 and 9 modify the width of the tile (in a tiled fashion) and digits 10 and 11 modify the height in the same way. If that made any sense, good luck!
This is a lot simpler than I expected. It's a test for a Java game I'm helping friends on, called Dungeon Runners. This is a test for the tiling system.