On ChicagoServers, you pick your CS2 server's game mode by name: open the Startup tab of your server in the control panel, choose Game mode (Competitive, Casual, Wingman, Deathmatch, Arms Race or Custom), click Save startup and restart the server. The panel sets the matching game_type and game_mode for you.
While the server runs, you can also switch the mode on the CS2 tab: choose it under Game mode and click Switch now. The map restarts in the new mode, and the server starts in it from then on.
Arms Race needs an Arms Race map, such as ar_baggage or ar_shoots (choose it under Map). Settings for one mode only go in that mode's file on the Configs tab, for example Competitive mode only.
For reference, these are the game_type and game_mode values of CS2's modes:
| Name | game_type | game_mode |
|---|---|---|
| Casual | 0 | 0 |
| Competitive | 0 | 1 |
| Wingman | 0 | 2 |
| Arms Race | 1 | 0 |
| Deathmatch | 1 | 2 |
| Custom | 3 | 0 |
CS:GO modes such as Demolition, Danger Zone and Guardian aren't part of CS2.
Need help? Open a support ticket and we'll take a look.