Also, a useful tip is to _use_ the enemy resupply rooms. Its really easy in 2fort4 since the upper supply room stays open for so long. And in 2fort5 you can either follow someone out, or hang out by the exit and run in just as someone else runs out. You have to be careful on 2fort5 tho, since the doors will sometimes close on you... and do too much damage.
Submitted by Toxy

If a sentry gun can see you, and you feign, it will keep shooting and missing you. So if you're out of grenades and there's nobody around, you can whip out the double barrel, shoot the sentry, feign, change colors, un-feign, and repeat the process. Just be sure you don't do it right in front of a wall, because you'll take radius damage from exploding rockets. Good in 2fort4 to keep engineers away from sentries that they put right next to the flag. Just feign and it will keep shooting, nailing anybody who goes down the corridor (usually the engineer who built the gun).
Submitted by Toxy

If your playing tf on the map Unholy Kingdoms by Dyermaker a good tip is to go to the enemy sniper tower disguised as an engineer. If theres a sniper when you first get up there ( very unlikely ) , feed him a few ludes while strafing then knife him in the back or on top of him. Then stay up there for a while. The hole when you look down on the lower sniper deck, count to 2 slowly then chuck a grenade into the entrance to make ppl dizzy as they go out. Then if there are any sentries around do the same as above but with regular grenades. Any snipers shoot them in the head with a lude then with your nailgun or Mac10 shoot his head a bunch of times and then he'll go "WTF!?!?!", now all you do is shoot ppl with lueds as they walk out of the base. It's fun but some ppl might call ya campers :)
Submitted by Tassadar[OS]

In Well6, make your way up to the room of the enemy fort (or yours if it's being completely overrun). You'll find the area with backpacks and a hole in the roof. This is the most evil thing you can possible do to your enemies. Grab all four packs and then drop 4 gas bombs on different parts of the lobby below. Then repeat. When they start getting the idea and come up after you, feign and wait for them to pass. Then do it again. Even if it doesn't skyrocket your frag count, it'll drive the enemies out of their lobby. On a no-friendly-fire game, you can have your allies attack as well. It'll screw up their vision, but just so they shoot everything they see, it isn't a problem.Eventually, they'll drive you out. So pay them back by becoming a scout and running in while they're out counter attacking youOf course, on Friendly fire games, this technique isn't that productive. However, it is nice to always gas the doors leading to the respawns.
Submitted by Sir Ed Die

What do you call a spy who's been caught off guard? Dead, unless you can think fast. Most TFC servers have footsteps enabled, so turn your volume up to max and be listening for someone coming up behind. If you here a shotgun being reloaded, get away, but don't act like you're running for your life. Head towards the area where someone of your class should be. And if footsteps aren't enabled, then remember to keep a constant check on your surroundings. Don't stand still and face the door of your oponents spawn room, put your back to the wall and watch. Never let the other guy see your back, unless he's a corpse.
Submitted by E.Novak

I've noticed a LOT of spies on both sides go charging off the sniper deck (2fort) and into the enemy base while disguising. That is a very bad idea. If the enemy sees a spy coming in they will all go around shooting each other, while this proves helpful it also tends to get you blown up. So what you do is disguise BEFORE you go charging into the enemy base, and I mean change your skin not your color, a red running back into the red base tends to be shot.
Never, and I mean NEVER go in as a class the enemy only has one of. I was being a HW once, and the enemy spy ran right up to me and it showed my name, which is a dead giveaway that the player is a spy. Also it's best to pick a skin of the enemy team that's on defense.
Submitted by Shadow

When you have to do battle with a hwguy, while running at him and strafing from side to side, try to tranq him once (this is not always neccessary, but does make it easier to sink you're knife in his back). Then get right in his face, and switch immediatly to the knife. While he's wondering what's going on and using up alot of ammo, try to "strafe" around him to his backside, and swing that knife into him. He usually can't get more than a few shells into you, and you'll be taking chunks out of his back in the meantime. The key to this technique is to wait 'till you're behind him to sink the knife - takes no more than two strikes to kill him, and usually only one. Using this method, I can easily kill most hwguys, and take very little damage in the process.
Submitted by Dream Machine

I've noticed a LOT of spys on both sides go charging off the sniper deck (2fort) and into the enemy base while disguising. That is a very bad idea. If the enemy sees a spy coming in they will all go around shooting eachother, while this proves helpful it also tends to get you blown up. So what you do is disguise BEFORE you go charging into the enemy base, and I mean change your skin not your color, a red running back into the red base tends to be shot. and tip #2 never and I mean NEVER go in as a class the enemy only has one of, I was being a HW once, the spy ran right up to me and it showed my name, which is a dead giveaway that the player is a spy. Also it's best to pic a skin of the enemy team thats on defence, I was attacking a spy and noticed his health drop to -182.
Submitted by �H���W