That's cleared up, let's address the 'how'. You'll need Garry's Mod 13, the current beta that Garry's been developing for the last year. If you have GMod on Steam you'll now have access to the beta.

The internet may break this week under the weight of Opinions About Paid Mods, but it's worth taking a moment to hear Garry Newman's position. As the creator of Garry's Mod – a fully fledged ...

Garry's Mod allows players to pull any asset like characters, items, and locations into a sandbox and create whatever scenario or sequence they can from the tools available.

In our world, though, Garry's Mod won out, and JBMod is only just making its way to Steam now, 18 years later. "JBMod was the first mod ever released for Half-Life 2," developer Team JBMod explains.