The mapper viggles has just released his third beta of his singleplayer map Breach. It is a large Doom2 singleplayer techbase map for limit-removing ports (ZDoom, PrBoom+, Eternity etc.) and from what you can see now, it looks highly impressive. For more screenshots and a playable version check the development thread at Doomworld and make sure to give viggles what he wants: Detailed, critical, nitpicky feedback!