1. Shortly before Jazz 2's release, the Jazz 2 team claimed that there would be 12 guns. Assuming they were not counting shields, what are two of the other three guns that are in the game but can not be fired? (Hint: They do not have their own event in JCS and do not come from enemies. You also do not see them in most levels and they are not used in any of the official levels.)

I'm assuming you mean the Fireball gun unpowered up and powered up, despite those both being the same. Unless you mean the Blade Gun, whose image you can get by changing sprite values sometimes.

2. What was the first game to be released using the Jazz 2 engine?
Battery Check, which you bought with batteries.

3. Which game, Jazz 1 or Jazz 2, uses more 3D effects with ambient lighting turned off?
(JJ1 has ambient lighting?) Uhhh.. JJ1?

4. Which JCF user has the most warnings?
That's unfair. How could anyone know that? And any answer I could give would be a personal attack.

5. Early in Jazz 2's existance, Jazz2City was looking for photos of what Jazz 2 team member?
Michiel?

6. Say that "John" was creating a Jazz 2 level. John had a set up somewhat like this, where each event took up three horizontal tiles:

(diagram)

"John" had a problem. When the rabbit came out of the one way solid block, Jazz would go really high above the ground and into a secret area it was not supposed to be able to get into. Which event could "John" place in the tile labled "No Event (2)" in order to make it so Jazz would not fly as high when he came out of the one ways?
Float up. Or he could just make the one way blocks taller.

7. What bug related to ammo amount did the 1.23 patch fix in multiplayer but not in single player?
Having more then the maximum by shooting powerups.

8. The "TSF Virus" was, in fact, not a virus. What was it actually classified as?
A trojan? I'm really not sure what you're talking about.

9. What are the servers with the name "Unknown" on the server list actually and why are they impossible to join?
There aren't any on the server list. gip.php, on the other hand, is different.

10. A Jazz quiz at Jazz 2 Stuff was created way back in 1998 and many people took it. Who got the highest score?
Dino, I believe. I could check, but I won't - sounds like cheating.