Retro themed video slots are getting very popular. Retro is a term used for an earlier style coming into vogue again. These slot games have five reels but predominantly use the symbols of the old electromechanical land slot machines. One of the main reasons for their popularity is that the bright, bold and simple symbols are suitable for mobile gaming. There is no loss of visual enjoyment on the smaller screens of the mobile phones. Way back in 2010, Microgaming pioneered the trend in retro themed video slots much before the massive surge in mobile casinos.

The first video slot in the three games series is titled Retro Reels. It is a 20 paylines game in the 5x3 format. The reels set in a slot machine console add to the retro effect. The symbols used in Retro Reels are $ sign; 7s of three different colors; triple, double and single bars; and cherry, lemon and plum. Mixed 7s and mixed bars deliver the lowest line payouts. The $ sign appropriately has the pride of place. It starts paying out when two appear left to right in an active payline. The five of a kind payout is a whopping 10,000 coins. The next highest five of a kind payout is for the red 7 and is only 500 coins. Retro Reels has a high variance suited for risk taking players.

The free spins feature is also structured slightly differently than in most video slots. It is triggered by only two or more scatter symbols appearing anywhere on the reels. You get five free spins for each scatter symbol on the reel. The Retro Reel slots also have the innovative Re-spin feature. It allows you to spin only one reel, keeping the others fixed, for a price. This introduces further risk and challenge in the game.

The second Retro Reels slot is subtitled Diamond Glitz. There is a sparkle of diamonds everywhere. Instead of the three 7s, you have triple, double and single diamonds. The liberty bell replaces one of the fruit symbols. You now require three or more scatter symbols to trigger the free spins and the number of paylines has been increased to 25.

Some changes continue with the third Retro Reels slot game, which is subtitled Extreme Heat. Flames are added to the graphics and the symbols. The number of paylines is further increased to 30. The number of free spins awarded is reduced. And the flaming $ sign becomes a wild symbol.