FSC
I decided to post some information :)
There are 5 secret mini-games. People've found Exterminator, Ed the SCV 2, and Gladiator with no problem. Beating each of these games unlocks another secret.
So, yes it is worth it to beat all 50 or so levels of Exterminator. If I remember right, The Fields of England and The Crowd are the hardest levels, they get slightly easier after that. There are bonus levels where you can get lots of gold if you kill every single bug from a location (like The City). Always upgrade your attack strength as much as possible (you'll definately need it for the elemental bugs), and buy nukes with any left over gold (for use on The Fields of England and The Crowd, when you know a bunch of them are going to get past). To use Nukes, move you mouse over the N icon, and then click on the screen where you want the Nuke to go off (which should kill every bug on the screen). I didn't find Horizontal or Vertical bombs to be of much use, but you might. Oh, and remember to use the mouse :) There also might be an error with buying Nukes, I'm looking into it.
The fourth mini-game, which no-one has found yet for good reason (I forgot to add a way to unlock it), was added with Patch I. I think it is one of the harder ones to unlock. There is no reward for beating it, and is unfinished (only 10 or so levels).
The fifth mini-game is unlocked when you find the rest of the 13 secrets. This is also unfinished, but contains quite a chunk you can play through.
Good luck all, once all the secrets are found and a guide detailing where they are is posted, I'll release the source code to FIAT.
There are 5 secret mini-games. People've found Exterminator, Ed the SCV 2, and Gladiator with no problem. Beating each of these games unlocks another secret.
So, yes it is worth it to beat all 50 or so levels of Exterminator. If I remember right, The Fields of England and The Crowd are the hardest levels, they get slightly easier after that. There are bonus levels where you can get lots of gold if you kill every single bug from a location (like The City). Always upgrade your attack strength as much as possible (you'll definately need it for the elemental bugs), and buy nukes with any left over gold (for use on The Fields of England and The Crowd, when you know a bunch of them are going to get past). To use Nukes, move you mouse over the N icon, and then click on the screen where you want the Nuke to go off (which should kill every bug on the screen). I didn't find Horizontal or Vertical bombs to be of much use, but you might. Oh, and remember to use the mouse :) There also might be an error with buying Nukes, I'm looking into it.
The fourth mini-game, which no-one has found yet for good reason (I forgot to add a way to unlock it), was added with Patch I. I think it is one of the harder ones to unlock. There is no reward for beating it, and is unfinished (only 10 or so levels).
The fifth mini-game is unlocked when you find the rest of the 13 secrets. This is also unfinished, but contains quite a chunk you can play through.
Good luck all, once all the secrets are found and a guide detailing where they are is posted, I'll release the source code to FIAT.