The Core is a classic retelling of the events surrounding the Resonance Cascade disaster from a new perspective. Featuring intense action, complex puzzles and believable narrative, through all-new locations within the Black Mesa Research Facility.
A neat look at the design process of Cendark3 - one of my maps for The Core. Note that this video begins when the map is around 2 days into development already, then continues through three days of additions and tweaks.
I really like this method of showing changes, and I'll definitely be doing it on future maps!