Please pardon my un-tech-saviness.....These codes -- I've never heard of them. Are they essentially cheats? Are they something the developer built into the game?
I'm on Level 196 -- Basic. I didn't know and appreciate learning through this thread that there is no limit to the number of levels. I guess I'll try something other than basic for a little more variety. The only thing out of the ordinary in nearly 200 levels is the one time (around level 30 or 40) I encountered Titan -- but only once. And, I don't think I've had even one perfect game.
I'm quite addicted, but keep wondering when something new or different will happen. Is it just the same over and over again (with the need to upgrade)?