its not hard to make ur custom mutations and modification what u need to do to make ur own infinate ammo lobby or what ever go look up <how to make a lan server> on youtube if u need help with that let me know and if u want special mods like shot gun pistol or what ever just check these 2 sites gamebanana.com and l4dmaps.com and look in the scripts any thing that changes how you play with guns like changing the rounds or for say there is a mod on l4dmaps.com that makes the granade launcher into a big ass m-60 that shoots grande launcher rounds (semi-auto) ♥♥♥♥ load of ammo tho