It's fun to play a game that won actually allow you to play it, i.e. its fun not to b able to place towers anywhere, at all, and if you do, you may or may not be able to put the gems in them, and the continuously wonderful ability to not allow one to move freely about the map without it scrolling back up with a remarkably annoying effect. even more delightful is the captivating way that some or all of these wonderful characteristics can occur at any given time, even hours into the game, therefore just enhance this lovely little gaming experience...oh, and it's a tad slow 5/5
yeah it's not a puzzle, I like multiple ways of reaching the goal