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Happy Nebula Adventures is a publisher of role playing games. The company's two major products, Revelation and Shadow Hack, use an in-house game mechanic system, the Happy Nebula System.

Revelation is a modern fantasy game and Shadow Hack is a futuristic dungeon hack. Both games mix technology and modern weapons with magic; in fact, there is a great deal of common content between the two games and material from one is generally compatible with the other.