The Star Gate is a deduction game for Stonehenge: An Anthology Board Game and its Nocturne Expansion. Players take turns being the encoder, who selects a card from her hand for people to guess. The other players are decoders, and take turns being the lead decoder. As more people have had a shot at being lead decoder, more clues become available to the decoders who still haven't guessed; however the potential points for guessing the card correctly also decrease. Additionally, there's a little bluffing in the game, because the encoder may choose not to answer a query. The encoder scores points for deceiving the decoders; loses points for making an error. The decoders score points for correctly guessing the card's identity - more for doing it earlier.
The Star Gate is an official game for Stonehenge: An Anthology Board Game and the Nocturne Expansion.