Oh joy, it's another Thing-Thing game. If you've read my review of Thing-Thing 2 (here), you can probably guess I'm not terribly enthused about playing Thing-Thing 3. But I'm currently in a period of working through some of Kongregate's older badges, which often means playing games that probably wouldn't meet today's badge standards, so unfortunately there'll probably be some mediocrity in the process.
Anyway, Thing-Thing 3 is not terribly different from its predecessor. You're in a basic platformy environment, enemies constantly assault you from all directions, and you shoot them. They appear able to randomly spawn from any direction, and, in contrast to Thing-Thing 2, they now carry guns, so now dodging them is more a matter of luck than anything else. Especially annoying is when they shoot you from offscreen and you can't hit them back. The levels are much, much larger than in Thing-Thing 2, which is definitely nice, but it's very easy to get lost in them, especially in level 2, where you have to find a keycard which is nearly impossible to find (I finally gave up out of annoyance and looked in the comments to find where it is). A minimap would be incredibly useful. Thankfully, the doors which require a certain number of kills to pass are gone, so that at least makes Thing-Thing 3 less annoying than its predecessor in one respect.
The story mode does finally have an actual story. It's not a particularly interesting story, and mostly it seems to prove that your character is about as intelligent as a box of rocks, but it does actually exist. There's also a survival mode, which operates pretty much as you would expect. The graphics are pretty much as basic as they were in Thing-Thing 2; both you and your enemies are built from a variety of mix and match parts. The sounds are your typical gun sounds, and the background music is so ambient that you'll barely notice it at all.
Overall, Thing-Thing 3 is perhaps slightly better than its predecessor, but it's still simply too flavorless to be really interesting. There's just not enough variation on the basic plan of shooting people to make for a particularly interesting game, and all of the challenge comes from the question of whether the enemies will drop health packs when you need them to. Overall, the game is not particularly long; there's six levels, of which two are boss levels; the last boss is incredibly annoying, since you spend 80% of the time just chasing him across the screen, but not terribly difficult, so it shouldn't take you too long to finish the game, but at least for me, it grew boring and repetitive long before I actually finished.