Valve has followed through with its promise to bring bots to Left 4 Dead 2's Versus mode -- which was frantic enough before all the A.I.-controlled ghouls got added in. A recent patch added the functionality and made a few tweaks to the software development kit, which allows players to make awesome levels based on awesome Nintendo 64 games. Check out the full list of changes after the jump.

The Steam blog post announcing the patch's release promises that the changes will be integrated into the 360 version of the game via an upcoming title update.
Gameplay
  • Now ghost PZ's can never be staggered
  • Enabled PZ bots
  • PZ bots use their more aggressive survival mode behavior in versus and scavenge
  • Enabled finale manual spawn by default
  • Fixed human PZ players not getting counted when they were dead, allowing extra PZ bots to spawn
  • Reduced effectiveness of melee weapons against the Tank ( 5% of max health, from 10% )
  • Fixed a case where a player who dies, then is rescued from a rescue closet, and then is revived from a ledge hang receives the secondary weapon that he lost when he was initially killed
  • Improved SurvivorBot AI in cases where the bots refused to shoot through their teammates and became non-responsive
  • Fixed issue with witch sometimes taking on uncommon common properties
  • Fix for cheaters quitting before the vote to kick them would succeed and avoiding ban on server
  • VAC banned users can now play L4D2 single-player, commentary mode and credits

Map Fixes
  • Dark Carnival Fair Ground: added env_player_blocker to keep special infected from getting stuck
  • Dark Carnival Fair Ground: added navigation area that was missing
  • Dark Carnival Fair Ground: Disconnected drops that were blocked by the top of a fence
  • Swamp Fever Plank Country: Deleted 2 nav areas that connected between tree trunks you can't pass through
  • Swamp Fever Shanty Town: Redrew ladder thinner so special infected could climb up to the roof
  • The Parish Waterfront: Fixed various navigation areas
  • Mall: Tuned spawning for difficulty

SDK Content
  • Added missing nature/blend tooltextures added
  • Added missing cs models/textures
  • Added missing acunit01 model/texture
  • Added missing ammo_can_02 model/texture
  • Added missing patio_chair model/texture

This article was originally published on Joystiq.