RSVP: Vertical Crossword Game

RSVP is a word game played on both sides of an upright game board, resembling a vertical version of Scrabble, and, being 10 years younger as a game, possibly inspired by it. The object of the game is to form horizontal and vertical words by placing letter blocks in crossword fashion on your side of the board, while blocking the formation of words on the opposite side and, if possible, taking advantage of them.