Well, besides, a great 24 hour cinema, Tref Theatre also has a nice little arcade off to the side (opposite the concession stand). Its a little dirty, I suppose, and its true we haven't updated the games in twenty years, but the games are free and we don't frown upon kids hanging out all day.
Super Mario Bros.
http://leenks.com/link71567.htm
Tetris.
http://leenks.com/link71168.htm