What version of CS:GO do I need to play on Optix9?
To play on Optix9 servers you need classic CS:GO, which exists on Steam as a free app separate from CS2, called Counter-Strike: Global Offensive. CS2 cannot connect to classic CS:GO servers. Once it is installed, you join by typing connect 155.117.117.76:27225 in the in-game console (or the port of the server you choose).
Why can't I join with CS2?
Optix9's CS:GO servers run classic CS:GO, not CS2. Even though they share a name, they are technically different games: the CS2 client is not compatible with classic CS:GO servers, so even with CS2 installed and up to date you will not be able to connect. The solution is to install classic CS:GO, which is still available on Steam as a separate free app.
How to install classic CS:GO for free from Steam
On the Steam store, classic CS:GO is listed as Counter-Strike: Global Offensive, an app separate from CS2. Go to https://store.steampowered.com/app/4465480/CounterStrikeGlobal_Offensive/ from your browser or from Steam, click Install (it's free) and wait for the download to finish. Make sure you install exactly that app and not CS2: if you search for Counter-Strike in the store, double-check the name before installing.
How to connect to the Optix9 servers
Open the game and enable the console in Options → Keyboard (or add the -console launch option in Steam). Then open the console and type connect 155.117.117.76:27225 for Mix 1. Other ports: Mix 27235, 27245 and 27255, FFA DM 27215, Wingman 27315, 27325, 27335 and 27345, and Public 27305. You can also use the Connect button at https://optix9.xyz/servers, which opens the game pointing straight at the server. Playing does not require registering on the website.
128 tick and automatic downloads
Optix9's Mix servers run at 128 tick, in a 5v5 format with captains and MMR ranking. The first time you join, custom content (maps and sounds) downloads automatically via FastDL, so you don't need to download anything manually. If you have questions or trouble connecting, join the community Discord: https://discord.gg/optix9
Preguntas frecuentes
Is classic CS:GO free?
Yes. It exists on Steam as a free app separate from CS2, called Counter-Strike: Global Offensive. You install it from https://store.steampowered.com/app/4465480/CounterStrikeGlobal_Offensive/
Can I play on Optix9 with CS2?
No. Optix9's servers run classic CS:GO, and CS2 cannot connect to classic CS:GO servers. You need to install the free classic CS:GO app from Steam.
Can I have CS2 and classic CS:GO installed at the same time?
Yes. They are two separate apps on Steam, so you can keep both installed and choose which one to open each time.
Do I need to register on optix9.xyz to play?
No. Playing is free and does not require registering on the website: just install classic CS:GO and connect with connect 155.117.117.76:27225 or with the Connect button at https://optix9.xyz/servers