Spherical Nightmares is a Half-Life 2: Episode Two single-player modification. The story takes place in the Half-Life universe and you take the role as Gordon Freeman. Your journey begins in an unknown location.
I played this a while back in a play test, and I had to admit its one of the better source mods ive played in a while. It has that old nostalgia feel to singleplayer games, where the story isn't incredibly blunt but more subtle and leaves it up to the player.
Wizard really got his own unique style of level design down, and I feel like this is just a must play, its visually great, and the combat is fun as hell.