Where was the game manufacturer who introduced RSVP based?
RSVP (board game) RSVP was a vertical version of "Scrabble" introduced by Selchow and Righter in 1958 and promoted as "3-D Scrabble". Two players spelled words using cubical tiles with letters on an upright grid board.
Sierra Entertainment Sierra Entertainment, Inc. (formerly On-Line Systems and later Sierra On-Line, Inc.) was an American video game publisher based in Bellevue, Washington.