Prerequisites
- Steam
- Source SDK 2013 Base Singleplayer (install via the tools page on your Steam library)
Installation
Step 1: Download the game on the downloads page.
Step 2: Copy and paste the game into STEAMDIR\steamapps\sourcemods. If the folder doesn't exist, create it yourself.
Step 3: Restart Steam.
Shoot Stuff should now be in your steam library. Enjoy.