The Collector (One Hour Game Jam)

Here's how you play the level

TL;DR: It's a Half-Life 2 Map.

Too short; Didn't understand:

I own Half-Life 2

• Make sure you have Half-Life 2 installed
• Move the bone.bsp-file into: Steam\steamapps\common\Half-Life 2\hl2\maps
• In your Steam library, under properties, set the launch option: -console
• Start Half-Life 2
• Enter map bone into the console

I don't

• In your Steam library, under tools, install Source SDK base 2013 Singleplayer
• Right click on it.
• Under properties, set its beta to upcoming
• Under properties, set the launch option: -console
• Move the bone.bsp-file into: Steam\steamapps\common\Source SDK Base 2013 Singleplayer\hl2\maps
• Start the Source SDK
• Enter map bone into the console