Minecraft clone FortressCraft has grossed $1 million in its first six months on Xbox Live Indie Games.
Kotaku reports the milestone figure makes FortressCraft the highest-grossing XBLIG since the channel's inception.
Developer Projector Games said the figure is gross revenue, not profit, gleaned from 350,000 units sold.
An official Xbox Live Arcade port of Minecraft is on the way from original developer Mojang in collaboration with 4J.
Minecraft, which officially releases in November, has sold 3 million copies.