Return of the Sphinx is a 3-reel, 5-pay line slot machine with a three-level progressive jackpot to be won. It has that old-school feel to it with the aged graphics. Play Sphinx 3d Progressive slots by Spielo online. This free slot features: 5 reels, Bonus Rounds, Free Spins, Multiplier Symbols, Scatter Symbols, Wild symbols. Behold the ancient Sphinx in this 5-reel slot machine by Spielo software, which has two special bonus rounds to taking you deep into the tomb of the pharaohs.