Here's a list of the hints the game slowly doles out:


Scout
You capture points faster than other classes! double jump while in the air!
As a Scout, jump again in mid-air to change direction, and avoid enemy fire.
As a Scout, you capture control points twice as fast as other classes.
As a Scout, you're most effective when you stay moving and use your speed to your advantage.
As a Scout, your Scattergun is lethal at point blank range.
As a Scout, your Pistol is great for picking off enemies at a distance.

Sniper
Your sniper rifle will power up to do more damage while you are zoomed in!
aim for the head to do critical hits!
As a Sniper, the longer you spend zoomed in the scope, the more damage the shot will do.
As a Sniper, aim for the head to do critical damage.
As a Sniper, zoom with the sniper rifle by hitting %attack2%.
As a Sniper, use your secondary submachine gun to deal with nearby enemies.
You can hit '%attack2%' to zoom with your sniper rifle.

Soldier
Shoot your rocket launcher at enemy's feet! Use your rocket launcher to rocket jump!
As a Soldier, you can rocket jump to great heights by simultaneously jumping and firing a rocket at the ground.
As a Soldier, aim rockets at enemy's feet to ensure they can't avoid the explosion damage.
As a Soldier, make sure you keep your rocket launcher loaded. Hit %reload% to reload it at any time.
Hit %voicemenu 0 0% to call for a Medic if you get hurt. Nearby Medics will be notified of your need.
Hit '%reload%' to reload your rocket launcher. Reload it whenever you're out of combat!

Demoman
Remote detonate your stickybombs when enemies are near them! Stickybomb jump by standing on a stickybomb and jumping as you detonate it!
As a Demoman, hit %attack% to fire sticky bombs and then use %attack2% to detonate them later.
As a Demoman, the longer you hold down the fire button, the farther the shot will go.
As a Demoman, set off sticky bombs beneath your feet to pipe bomb jump up to great heights.
As a Demoman, shoot sticky bombs onto walls and ceilings where they're hard to spot.
You can hit '%attack2%' to detonate stickybombs even while using your grenade launcher.
You can hit '%attack2%' to detonate stickybombs launched with your stickybomb launcher.

Medic
Fill your ÜberCharge by healing your team mates! Use a full ÜberCharge to gain invulnerability for you and your medi gun target!
As a Medic, use your medigun to heal teammates, and buff them up to 150%% of their normal health.
As a Medic, fill your ÜberCharge by healing teammates. Then hit %attack2% to go invulnerable.
As a Medic, your ÜberCharge makes both you and your medigun target invulnerable for a short time.
As a Medic, you fill your ÜberCharge faster by healing teammates who are more hurt.
As a Medic, keep alert for teammates calling for your help. Use the medic arrows onscreen to find them.
You cannot go invulnerable when you have the briefcase.
Cannot capture point while invulnerable.

Heavy
Spin your minigun without firing to be ready for approaching enemies!
As a Heavy, hold %attack2% to keep your minigun spinning, ready for approaching enemies.
As a Heavy, you're a great Medic buddy. Keep a clear line of sight to your Medic to keep the medigun on you.
Hit %voicemenu 0 0% to call for a Medic if you get hurt. Nearby Medics will be notified of your need.
As a Heavy, your minigun chews up a lot of ammo. Pick up fallen weapons to refill your supply.

Pyro
Ambush enemies at corners! Your flamethrower is more effective the closer you are to your target!
As a Pyro, your flamethrower does more damage the closer you are to the enemy.
As a Pyro, ambush enemies to catch them in the short range of your flamethrower. Use corners to your advantage.
As a Pyro, your flamethrower chews up a lot of ammo. Pick up fallen weapons to refill your supply.
As a Pyro, switch to your shotgun if enemies retreat beyond the short range of your flamethrower.
As a Pyro, you can often set enemies on fire and retreat, leaving them to die from the burning.
Hit %voicemenu 0 0% to call for a Medic if you get hurt. Nearby Medics will be notified of your need."

Spy
Disguise yourself as a enemy and infiltrate the enemy base! cloak yourself to avoid being seen! Backstab your enemies with your knife for an instant kill! Plant sappers on enemy sentryguns to destroy them!
As a Spy, use your knife to backstab enemies from behind, killing them instantly.
As a Spy, disguise yourself as an enemy with your disguise kit. Beware, attacking will remove your disguise.
As a Spy, hit %attack2% to cloak and become fully invisible for a short period of time.
As a Spy, use your cloak to get behind enemy lines, and your disguise to move around amongst them.
As a Spy, try to act like an enemy while disguised. Observe where enemy team members are, and disguise as one of them.
As a Spy, place your electro sappers on enemy sentry guns to destroy them. Disguises aren't lost when placing sappers.
As a Spy, your electro sappers disable sentry guns before destroying them. Sap a sentrygun before attacking the engineer.
As a Spy, call for enemy Medics by hitting %voicemenu 0 0% while disguised.
You cannot cloak when you have the briefcase.
You cannot disguise when you have the briefcase.
You cannot attack while cloaked.
Cannot capture point while stealthed.
Cannot capture point while disguised.

Engineer
Collect metal from fallen weapons to build with! Build sentryguns to defend your base! Upgrade them to level 3! Build dispensers to supply your teammates with health & ammo! Build teleporters to help team mates get to the front lines!
As an Engineer, use the build tool to place sentryguns, dispensers, and teleporters.
As an Engineer, you need metal to build, repair, and upgrade your buildings. Collect fallen weapons to get more metal.
As an Engineer, hit your sentrygun with your wrench to upgrade it with metal. Each level adds more health and firepower.
As an Engineer, build dispensers to provide your teammates with health and ammo. They also generate metal for you to use.
As an Engineer, build teleporters to help your team reach the front line faster.
As an Engineer, keep an eye out for enemy Spies attaching sappers to your buildings. Use your wrench to remove sappers.
Hit constructing objects with your wrench to make them build faster!
Hit your teammate's constructing objects with your wrench to help them build faster!
Build sentry guns to defend your team's base. The fourth slot in your weapon selection holds buildables.
Build Dispensers to help your teammates to resupply. The fourth slot in your weapon selection holds buildables.
Build Teleporters to help your team defend forward areas. The fourth slot in your weapon selection holds buildables.
Pick up metal from fallen weapons to use in building objects!
Hit damaged objects with your wrench to repair them!
Upgrade sentry guns by hitting them with your wrench. They can be upgraded all the way to level 3!
You cannot teleport when you have the briefcase.
You can hit '%attack2%' to rotate buildings before you place them.

Misc/Other
Hit %voicemenu 0 0% to call for a Medic if you get hurt. Nearby Medics will be notified of your need.
Pick up ammo from fallen weapons!
Shoot the sapper to destroy it!