Dolphin's Pearl Deluxe is a 10-payline upgrade on the original 5-line version that used
to be common on Gaminator machines in B&M casinos. Along with Lucky Ladys Charm,, the
excellent Book Of Ra Deluxe and Columbus Deluxe,, Novomatic took a load of their popular slot games
and have now put them online.
The deluxe version of Dolphins pearl is the only version available to play online - pretty sure the old 5-liner has now been retired although I did play a sub-licenced version of it in a casino in Budapest in 2010 so it is still about. Not here in the UK though. Like the aforementioned Lucky Ladys Charm and the B&M-only Egyptian Experience (based no doubt on Aristocrat's original Queen Of The Nile game), Dolphins' Pearl has a free spin feature that awards 15 free spins at 3x.
The feature does tend to retrigger quite a lot - not always but it's not uncommon to end up with 45 or even more free spins when you hit the Dolphins Pearl feature. It's a volatile game (like most Novomatic games) so it needs to be treated with some respect but when you hit a streak it can be pretty damn appealing! One of my favorite games as it happens but overall I am well, well down on it!
If you want to try out Dolphin's Pearl then you can check out a free version at GFM on the Dolphin's Pearl page. It doesn't require a download or registration.