The online video slot Gem Star by Amatic, has a theme of floating gems through space. This Gem Star casino game has no less than 100 pay lines and a playing field with 5 reels and 3 rows of symbols, so you can win multiple winning combinations with one spin. If you get the Wild symbol, then the credits will fly you around the ears. Gem Star has the ability to double or quadruple your profit by using the Gamble feature. Enough reasons to try this machine for free.