Thread:Vorknkx/@comment-3547390-20150204202730/@comment-1496755-20150428093515

Abyss of Pandemonium offers some pretty good level design (with a few minor exceptions) and is free to download :)

Aftershock is also decent - the three "official" episodes are enjoyable. And they bear the ODSOA (Official Deathstalker Seal of Approval).