Big Tree

 is the first Bot Zombie Mod map in Counter-Strike Online.

Overview
Big Tree is the first map that supports Zombie Bot. It promotes to basic Zombie: The Original system with bots addition. Bot navigation has been tweaked a bit so that it is compatible to Zombie Mods. The several modifications to bot are:
 * Adding new function: Zombie safe area.
 * No attack delay to all bots.
 * If one teammate is infected in a camping area, other human bots will rush to another safe area. There are two safe areas for bots in this mode.

Release dates

 * South Korea: This map was released on June 28, 2012.
 * Taiwan/Hong Kong: This map was released on July 4, 2012.
 * Japan: This map was released on July 4, 2012.
 * Thailand: This map was released on September 18, 2012.

Gallery
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Trivia

 * There is a tunnel in the area which is similar to ducts.
 * In the tunnel there are rats and bats, the bats will fly out once any players entered it.
 * The rats model are taken from a cut model in Half-Life while the bats model are taken from Banshee's Pulling ability.