Sentence:  The game has a tilt feature &mdash; tilt Fireball and a tilt sign glows and the scoring stops. The full-sized, full-color commercial <WSD>playfield</WSD> even has a special friction silk-screened surface so the ball will roll and not slide. 
Meaning of the word marked with <WSD> tags:  The area within which a game (especially a video game) is played.