NERF Build your Weapon [Ep 2] âž¡ .brBuild Your Weapon Challenges âž¡ .brNERF Blow Gun Challenge! âž¡ Subscribe .brNerf Gun War | NERF Hide And Seek [Ep 3]. A Nerf war is an activity involving Nerf Blasters or other foam-firing toy weapons. Nerf wars can be a wide range of .