Left 4 Dead 2 is one of Valve’s finest moments, a brilliant four player co-op zombie shooter packed with humour and character. And, as is the norm with the developer, plenty of PC-based map tools.
One such custom map is called Suicide Blitz 2, and can be downloaded here. Why bother? It’s brilliant, and is even more brilliant because it packs one hell of a Portal 2 easter egg. Seriously – you want this.
The video below will spoil it for you, but at least tells you how to get started.
You’ll need that gnome, then.