Weapon-jumping techniques requires the player jumps off the ground and, by using the proper weapon, immediately afterwards fires a bullet (rocket, grenade, plasma or BFG plasma) onto the spot on the floor exactly or very near beneath her/him. The damage of the resulting blast delivers momentum to the player's character and propels her/him higher into the air than possible by regular jumping. The gain in momentum can be used for vertical, horizontal, and diagonal movement. In "Q3A" four weapons makes self-splash damage and can be combined with each other—rocket and grenade launcher, BFG10K and plasma gun.