Today South Africa’s Thunderbolt Casino adds Diamond Fiesta, a glittering new Mexican slot game from Realtime Gaming, to its huge collection of slots and table games, all played in Rands. Two special features will result in loco payouts. “Expanding Reels” increases chances for a winning combination. And Day-of-the-Dead Skulls win free spins with extra Scatters, Wilds and Diamonds. The spicy new game arrives just in time for Mexico’s annual Cinco de Mayo celebrations.Until May 22nd, the popular South African online casino is giving all active players 30 free spins on the festive new game.Diamond Fiesta’s Jackpot Diamond Feature is triggered when 6 or more Diamonds appear anywhere. 3 re-spins are awarded. Diamonds stick during re-spins and new Diamonds are held for the remainder of the feature. At the end of the re-spins, each Diamond will reveal a prize value or Jackpot.If Diamonds occur in all four corner positions during the Jackpot Diamond Feature, the reels expand, first to 6X3, then to 6X4 and finally to 8 reels and 4 rows.30 FREE SPINS ON DIAMOND FIESTA Available until May 22nd to all players that have deposited in the previous 7 days.Coupon code: 30-FIESTAMax cash-out R500; playthrough 60X.One of South Africa’s most popular online casinos, Thunderbolt offers hundreds of slots and table games from Realtime Gaming. Many are also available in the mobile casino for smartphones and tablets.