Complicated mazes with specific paths to follow, to make more interesting levels.
Rooms.. .. There are no rooms, just a giant maze of corridors!
..And upgrading powerups/XP/etc. Each level is like a giant reset button.
But the game's still nice and fun, I think.
Additionally, I need to add a "Suggested by..." credit to my menu system. Along with the Number of Plays, and other little bits.
That "simple" titlescreen is getting busy!