Grenade Launcher

The Grenade Launcher is a weapon that appears in Return to Na Pali, Unreal 2, XMP, and Unreal Tournament 2004.

Return To Na Pali
One of the three Return to Na Pali's exclusive weapons. A UMS Grenade Launcher, its first appearance is in Neve's Crossing. Grenades can deal 80 damage.

Primary Fire: Throw a grenade which bounces through the environment. It will explode after a certain period of time or just on contact of a living being.

Secondary Fire: Similar to the primary fire, the grenade here never explodes (it will pass through enemies). It can only be activated by pressing the secondary fire's button again. In the meanwhile you can also throw a normal grenade after throwing the alternate one. Detonating this latter bomb causes both grenades to explode.

Unreal 2 and XMP
Unreal 2's Grenade Launcher, the M406 Hydra, is named after the many-headed Lernaean Hydra due to its ability to use multiple 40mm grenade types. At the beginning of the game Dalton only has access to eplosive fragmentation grenades, but he will collect the other types along the way. Regular fire launches the currently loaded grenade, whose explosion can be delayed by holding the trigger for a short while. Alternate fire cycles through grenade types.
 * Fragmentation - explosive load with sharp carbo-steel fragments
 * Toxic gas - caustic neurotoxic gas that eats through metal armor
 * Incendiary - burning phosphorous, will set almost anything on fire
 * Smoke - smokescreen for defensive use
 * Concussion - Sends out shockwave that knocks down most enemies
 * EMP - Disables electrical systems such as Force Walls

In XMP the Hydra works a little bit differently in that the different classes carry simplified versions of the weapon that can only launch two grenade types. Regular and alternate fire are dedicated to these two types. The Ranger has access to the Frag and Smoke types, the Tech has EMP and toxic, and the Gunner has Incendiary and Concussion.

Unreal Tournament 2004
''Easily one of the most diverse weapons in current use, the Grenade Launcher can fire up to eight grenades at a time, either seeding an entire area for later detonation, or directly targeting enemies. Lined with electrostatic emitters, each grenade adheres to both enemy vehicles and infantry, the detonation of which lies completely in the hands of the weapon holder. When employed with creativity and timing, the Grenade Launcher can be a very powerful weapon.''

Introduced in UT2004 for the Onslaught gametype, Grenade Launchers (weapon slot 7) shoot out projectiles which will bounce or roll until they lose momentum or until they encounter an objective, player, or enemy vehicle. Upon encountering one of these obstacles, the grenades will stick to that object and explode when the player who shot the grenades presses Secondary Fire, or when that player dies. An interesting application is to attach a grenade to a teammate (if friendly fire is off) and then have that teammate go on a suicide run into the enemy base. The exploding grenade will not hurt the teammate, but it will hurt whoever is around him or her.

One of the most effective weapons against stationary targets, and mobile as well, if wielded correctly.

Other
There are some other weapons capable of launching grenades.

The Rocket Launchers in Unreal and Unreal Tournament have an alternate fire mode that launches up to six grenades simultaneously. The Rocket Launcher in UT3 can fire up to three grenades simultaneously. (Regular rockets are rocket propelled grenades.)

The Assault Rifle in UT2003 and UT2004 launches grenades at a speed (distance) depending on the amount of time the alternate fire trigger was held. These grenades use different ammo than regular fire.