C4 is an Equipment in MC3's multiplayer-mode. It can be purchased for 5,000 credits. Once equipped, there appears a button on the screen to place the device. Once placed, the button can be tapped again to detonate the C4. The bomb can be helpful in tactical gamemodes like Capture the Flag, Destruction, or Bomb Squad, especially as the blast radius of the C4 is the largest of any explosive in the game. The C4 can be destroyed by gunfire or explosions without going off, so a discrete placing is advised.
The C4 is extremely uncommon in multiplayer. Despite of the large blast radius of C4, players rather spare their money for the Proximity Mine. Players also choose the Proximity Mine for user-friendliness, as the C4 is cumbersome to operate; it needs two taps to detonate, which can make it frustrating when a player has planted it down and wants it to detonate quickly. It can also be destroyed, just like with the other devices.
It can, however, be helpful to defend small corridors or flags/zones, however, for every purpose that the C4 does, the Proximity Mine can do better, as well as being more efficient.