GOG Gem Promo: The 7th Guest on sale for $3.99. Today Only By w00py | October 3, 2012 0 Comment This week’s GOG Gem Promo is The 7th Guest on sale for $3.99 (60% off). This deal is good for 24 hours only. Classic game. I remember playing this on Sega CD. Or was that Night Trap? Anyone remember that game?