Adjective : Bridge is usually a four-handed game.    From Dictionary.com. 

Esther Leah played the piano throughout her life, particularly fourhanded piano.    From Wordnik.com.  [Esther Leah Medalie Ritz.] Reference

"Come, shall we play a game at fourhanded billiards?".    From Wordnik.com.  [A Prince of Sinners] Reference

This is a rare fourhanded handshake among three people who are obviously please to be participating in the handshake.    From Wordnik.com.  [Life at Work: People, Projects, Politics and Pressure] Reference

The fourhanded mole shall scrape.    From Wordnik.com.  [The Early Poems of Alfred Lord Tennyson] Reference