Spikes is a modification for Quake by Hellblazr. This changes the Nailgun and Super Nailgun projectiles (note that while most modifications would also alter the Nail Traps, this does not) so that they are explosive.
The projectiles will explode immediately upon collision with an opponent (note that they are weak enough to not Gib a Zombie). If the nail projectile hits a wall, it will wait five seconds before exploding. The nail projectile will also explode prior to five seconds if an opponent enters its proximity range.
Note that this modification searches for a custom sound file that the readme file states is included. However, there are no sound files included with this modification. This will result in an error every time the player hits a nail projectile into a wall, since that is when it will attempt to play "artoo2.wav" and fail to find the file.