Fragmentation Grenade (Half-Life 2)
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The Grenade comes equipped with a red blinking light and a chirping timer that are played when the grenade is thrown, letting both the attacker and the victim know when an active grenade is in their vicinity. The Grenade can be thrown in three ways: throw, toss, and roll. The throw is activated by hitting the primary fire key, the tossing with the secondary fire key, and rolling with the secondary fire key while crouching. When thrown, these hand grenades have a fairly low bounce but due to their cylindrical shape, they will roll a significant distance if they land on a smooth surface, so these attributes should be taken into account when throwing them.
Most Overwatch Soldiers carry at least a few of these and use them to flush out and/or kill enemies. Unthrown Grenades can also be picked up by the player if dropped by a soldier, either with their hands or with the Gravity Gun, and throw them away or back at the enemy. When Freeman throws a grenade, it is thrown slightly towards the right of the crosshair, instead of the center. In a few Episode Two scripted sequences, Combine soldiers throw the grenades back. Likewise, during the journey to the Muscle Car, Gordon comes across a dumpster, with a Fast Zombie digging out boxes inside. If a Grenade is thrown in, the zombie will throw it back out. If another one is thrown, it will blow, and the zombie will jump out in flames.
"M-83 FRAG" can be seen written on the grenade's pin. However, the M-83 is an unrelated smoke grenade similar in appearance to the MK3A2.
The Grenade is a very useful tactical tool. Besides simply killing enemies, it is ideal for flushing out entrenched enemies, forcing soldiers out of cover and scattering concentrated groups of enemies. It is also very useful for knocking down Combine Sentry Guns from a distance if no object can be thrown at them.
Metrocops, Overwatch Soldiers and Overwatch Elites are the only enemies that will avoid a Grenade. As a result, Grenades are very effective against Zombies, as they generally move slowly and make no attempt to avoid the blast.
The Gravity Gun is a useful tool in the use of grenades (especially in Half-Life 2: Deathmatch), allowing for increased range and precision. The most widely used techniques include Grenade throwing and punting. Grenade throwing means dropping the grenade, picking it up, and using it as a makeshift airburst grenade, since the grenade can be cooked off easily once deployed. This is very effective against opponents in mid-air or behind obstructions. Grenade punting relies on dropping the grenade, then punting it, without picking it up. This allows for using the explosive very fast over long distances.
Grenades are bouncy enough to be thrown around corners with ease. However, they will lose a good deal of their momentum and will not bounce again. The grenade makes a distinct sound when it hits the floor; even if one does not hear the timer, the impact sound should be sufficient to alert the player to the presence of a grenade.
One should remember that the Grenade's timer will not start until it is thrown. This makes it easy to hold a grenade until enemies are in the right position.
In Deathmatch, by dropping a grenade behind a wall, or outside a vent, one is able to destroy obstacles such as S.L.A.Ms easily without harm caused to the player. Of note is that picking up grenades that have been thrown at the player will reset the timer.
 Related Achievements
|Any Half-Life 2 game|
|Hot Potat0wned (10G)|
|Kill a Combine soldier with his own grenade.|
|Half-Life 2: Episode One / Half-Life 2: Episode Two|
|Grave Robber (5G)|
|Steal a Zombine's grenade.|
 Behind the scenes
According to the Conscript model texture files, Conscripts were to use grenades. In the early versions of Half-Life 2, the weapon didn't have the ticking sound and red light. Both were added likely because it was harder to locate and escape them.
The cut weapon called the Vortex Hopwire uses the Grenade as its viewmodel.
According to Kerry Davis, in the Fast Zombie in a dumpster scene in Episode Two, the team rigged an entity called a physics explosion to create movement among the boxes inside the dumpster. One playtester threw a grenade into the dumpster and the physics explosion entity caused the grenade to fly back out. The player was shocked, thinking the Zombie had tossed back his grenade. Although this happened by accident the first time, the developers went ahead and set up the entities to make sure it would happen for every player who lobs a grenade into the dumpster.
A Zombine holding a Grenade in the dark of the City 17 Underground.
Alyx fighting Zombies while a Zombine launches a Grenade in the Hospital.
Alyx being caught in a Zombine's MK3A2 explosion in the Hospital.
 List of appearances
- Half-Life 2 at E3 2003: Traptown (First appearance) (Non-canonical appearance)
- Half-Life 2
- Half-Life 2: Deathmatch (Non-canonical appearance)
- Half-Life 2: Lost Coast (Non-canonical appearance)
- Half-Life 2: Episode One
- Source Particle Benchmark (Game files only) (Non-canonical appearance)
- Half-Life 2: Episode Two