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Skill levels (Easy, Normal, Hard, Expert) have been applied to the AI to accustom with server options and make it easier or challenging for players.In Counter-Strike: Condition Zero, the navigation of the bots have improved, notably the hostages as they have more interactions with players and can even escape on their own.Sniper bots are now more aware of their surroundings and will usually occupy long pathways/open areas in a defence stance.Due to this, bots' awareness of snipers have also increased and they will often strafe and work together with allied players to eliminate enemies.
Markus "Count Floyd" Klinge created an effective AI bot addon for Counter-Strike 1.6, now known as PODbot, and used feedback to tweak it through the years to make realistic bot interaction, much like Condition Zero soon after. PWF files which contained navigation data, a predecessor to the NAV system implemented in Condition Zero and Counter-Strike: Source. POD bots have three different aggression modes; normal, aggressive, and defensive.
The top priority weapons for normal bots are the SG552.
For aggressive bots, their preferred weapon is the AK-47 while the preferred weapon for defensive bots is the SG550.
After Ritual's own version was dropped, the production was passed to Turtle Rock Studios.
They worked on the AI for the single player part of the multiplayer piece, when they started to code NPCs for servers wanting more players on low servers.