This is a way to play around with Garry's Mod without needing a dedicated PC.
Free Garry's Mod is a way of playing the sandbox experience known as Garry Mod. You are given a map, assets and a physics gun to do what you please. You can fabricate or create anything and see how those things react to the game's intricate physics engine so long as your device can hold up to the stress.
"Gmod" can be overwhelming at first blush. The physics gun has many different features, each with its own interface. While its easy to add assets, you can overtax your device by adding too many. Adding mods allows for things like infinite health but even that takes some figuring out. The option of multiplayer gameplay means you can learn from someone more experienced and even concoct your own games to play with them.
This game is an amusement rather than a traditional video game. Rather than provide you with an end goal or fail state, all you can do is create.
Pros: Expansive options list for mods and creativity. Multiplayer. Uses Source engine assets.
Cons: Daunting to learn. Crash-prone. You need other games top ull assets from.