Scant few games stand the test of time and retain a large active player base sixteen years after release. But not only has Age of Empires II endured, it has thrived. It’s gained new steam thanks in part to an official high-definition re-release but mostly due to the ragtag group of modders-turned-developers who made that release possible. Forgotten Empires filled the game with new stuff and rebalanced the multiplayer in one enormous mod and then two HD expansions: The Forgotten and the recently-released African Kingdoms. I spoke to the team to find out about the challenges of transitioning from mod team to professional development studio, and of continuing to expand a game within its ancient limits.