In traditional 90s FPS fashion, the first expansion pack for Monolith Productions' phenomenal shooter Blood was developed by an outside studio. I hesitate to say "outsourced", because Monolith was working on their own expansion at the same time, so it feels like they probably just licensed the rights away. Either way, this was developed by Sunstorm Interactive, who had previously developed the often-bemoaned expansion Duke It Out In D.C. for Duke Nukem 3D, though their later work would be more positively received. Cryptic Passage for Blood is a fairly unambitious expansion that includes little to nothing in terms of new content, lacking the recreations of real-world locations of D.C. or the humorous high concept of Duke Caribbean: Life's a Beach. Sunstorm is simply content to create 10 new levels (and 4 multiplayer levels, though I didn't try those) with mostly stock Blood assets aside from some admittedly pretty cool new textures. These levels are somewhat variant in quality, with the worst one being mediocre and the best one being genuinely great. For the most part, Cryptic Passage is largely solid with a decent amount of creativity in the level design and a workmanlike approach to expansion development. I enjoyed most of the levels even if the expansion largely rides off of the success of Blood's weapon and enemy design, that's really not a bad thing to do at all. I will say, something that does suck is that some of the levels are too puzzle-based, which grinds pacing to a halt and the library is most guilty of this. Player guidance is also a problem as occasionally Sunstorm'll hide progression-related things in areas I struggled to find even with extensive exploration. Despite a couple of bum levels, Cryptic Passage is still a good bit of fun and I do recommend it for fans of Blood. Just make sure to go in knowing its fairly unambitious.