- Install or Purchase Garry's Mod.
- Subscribe to Cinema on Steam Workshop. Also subscribe to the official map, cinema_theatron.
- Launch Garry's Mod and Click on "Sandbox" in the lower right hand side of GMod's menu.
Then select "Start New Game"
Select Cinema on the left.
Then select a supported map icon on the right.
- Select Singleplayer on the far right, if you want a solo game, or Multiplayer if you want to host a server!
- Enjoy the experience of Cinema!