Back in 2002 sst13 made a nice looking little single floor map called The Black Realm. This was then rehashed as The Black Realm - Special Edition with a mirrored floor and other nice visuals. Well, sst13 is at it again. This time the level is called The Black Realm - HD.
So what has changed? At first glance you might not notice much but once you start to really look, the changes come through. There are architecture changes, the levels is brighter and the textures are a lot sharper, clearer as well.
Gameplay has improved a little due to the slight brighter environment and because the level feels more professional (if that was even possible).
It is still a single floor that suits fast Tourney matches, but it sure looks great.