Map Labs has started running mapping challenges of their own. So far the challenges have all been single player HL2: Episode 2 maps (actually running on an improved SDK 2013 version), so they’re definitely worth keeping an eye on!

This challenge was a “Test Tube” challenge – a 72-hour weekend challenge with the theme of One Room – the entire map should be set in one room. The challenge received a solid 16 entries, and here they are!