How to install c21_ost in CS 1.6?

Download the c21_ost map file (.bsp), place it in your Counter-Strike 1.6 "cstrike/maps" folder (usually at C:\Program Files\Steam\steamapps\common\Half-Life\cstrike\maps), and restart the game. The map will appear in the map selection menu or you can join a server running it.

How many servers are playing c21_ost right now?

Currently 0 servers are playing c21_ost. The map has been played a total of 621 times across 1 servers.

What type of map is c21_ost?

c21_ost is a Other map for Counter-Strike 1.6.

Other

c21_ost

Servers playing now

Total servers

Times played

621

Last played

Oct 17, 2026

Download from GameBanana Similar maps

Servers playing c21_ost0

No server is playing c21_ost right now. Browse the server list

Daily activity

Daily totals from Jul 11 to Oct 16, 2026

Servers that played c21_ost recently

1 server ran c21_ost in the last 90 days.

Server	Rounds played	Last seen
- rayish.com 2 - Hide-N-Seek [c21]	104	Oct 16, 2026

How to install c21_ost

Download the c21_ost.bsp map file from GameBanana or another trusted source.
Locate your Counter-Strike 1.6 installation folder. The default path is: C:\Program Files\Steam\steamapps\common\Half-Life\cstrike\maps\
Copy the .bsp file into the maps folder. If the download includes .wad or .res files, place them in the cstrike folder.
Restart Counter-Strike 1.6. The map will appear in the map list, or you can connect to any server running it from the server list.

About c21_ost

c21_ost is a map for Counter-Strike 1.6. It has been played 621 times across 1 servers. Last played on October 17, 2026.