How to start gmod in a certain gamemode?

Hello again all, I love gmod, and play online all the time, but the only way I can test gamemodes is in my own server, and my users hate that. Also, I can’t seem to figure out how to start a singleplayer game in a gamemode other than sandbox. Please halp!!!

– Kimzey

Maybe below, the “Sandbox” text with an hammer icon. You can change gamemode with this.

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