Pop bubble, receive bacon.
Once inside the fortress, you're on foot, armed with a gun, your collected bacon, and a jetpack that runs on eggs. The goal here is to find and destroy the Eye of Sauron which powers the space station, then find the exit before the fortress explodes with you in it. Of course there are enemies to worry about too and as the levels go on, the air fortresses become more and more mazelike.
Navigating with the jetpack is pretty cool, and when you shoot it kicks you back realistically. Any movement or shooting decreases your eggs, but standing still makes them quickly recharge. If you get hit by an enemy your maximum number eggs decreases, and if you run out of eggs, you die. The bacon acts as a limited use explosive shot, which explains why so many mistakenly believe that the B stands for bomb.
Every level works pretty much the same way and rapidly gets harder until, when you get to level 5 or 6, it's nearly impossible. I don't see how you'd ever be able to finish them all, but there 8 levels and then second quest versions of each level. Thankfully, there is a password system in this game so you don't have to do it all in one go. Seriously, some of these levels all but require you to map them out so you don't waste all your eggs wandering around and so that you can actually escape when you get to that point.
The music is pretty much the same throughout and has just two main tracks, one for each section, so by the third or fourth level you'll have them hopelessly stuck in your head. The graphics are pretty old looking, but not bad. They don't vary much by level though. The most impressive part comes when you destroy an air fortress's core (Sauron), which makes the lights flicker, the music go creepy, and the screen gradually start to shake as you dash to the exit. It's scary and panic inducing as there is no countdown clock to your destruction besides judging from the amount of shaking and noise.
Well, with that summary out of the way, you can now watch it in action in the videos below: