Sticky grenades in Modern Combat 3 are very uncommon online due to the low damage and underwhelming blast radius. However, it can be effective for finishing off wounded targets in tight situations, due to its speedier blast radius and particularly using them as "mines".
In multiplayer, there's a popular glitch where a player respawns after death and is blown up instantly by a sticky grenade. To perform the glitch, throw a sticky grenade at an enemy player's corpse before they respawn. Timing is important in this glitch. If the grenade explodes before the player respawns, the glitch won't work. After the enemy player respawns, the sticky will still be on the player and will blow up, killing the enemy player.
The ST174 Sticky Bomb (Charlz Technik GMBH Anti-Tank ST174, Sticky Bomb in-game) is a sticky grenade manufactured by Chralz Technik. It triggers an explosion that kills or injures enemies. Originally designed to take out tanks and other armored vehicles, it proved somewhat useful in urban combat situations as well.
Experienced players can use this as a portable mine by throwing it to a wall and attract enemies to close in. However, as opposed to the MC3 version, the grenade has only 3 seconds before detonation. This grenade is incredibly powerful, and is very effective through walls as well, provided that the enemy is standing close enough to the wall. With Explosives Expert or Grenades Expert, the Sticky Bomb is quite possibly the deadliest ordnance in the game. The Sticky Bomb also can be stuck to enemies, meaning that if you spot a group of enemies and stick one of the enemy members, you will be guaranteed a multi-kill if the enemies are standing close to each other. Of all the grenades in MC4, the Sticky Grenade is the most deadly against groups of enemies and is the most versatile.