Possible Clues:

• Place for sports/games
• Cassette button abbr.
• Letters on a red button
• Mute neighbor, maybe: Abbr.
• Button for taping
• ___ room (place for Ping-Pong)
• -- room (play place)
• With 55-Across, campus hangout
• Dictation machine abbr.
• Tape deck button abbr.