Press on one of the highlighted spaces to place a block down. Pressing on a block will erase it. Use the on-screen arrows to determine which block you would like to set down. Have fun!
(If you're looking to make your own map and preserve it simply read the note within the project!) Look, I had this idea before but never pursued it 'till now. Why? 'Cause I was bored, and the entire idea was purely experimental, I haven't done something EXACTLY like this. But let me tell you all about how LONG it took just to draw out each of these blocks. Multiple times I considered calling it quits before ushering on. Anyway, here it is! Ta da~