Few things are as boring as a classic slot machine in my humble opinion. You'll find the thrill of spinning those classic reels equivalent to taking sleeping pills or sitting through one of your old relative's stories about the way things used to be. Play'n Go is trying to change things up with their Big Win 777 slot, expanding the reels and features in the game. It is a good attempt, but unfortunately it doesn't do much to make the game too exciting.
Big Win 777 is a 5 reel, 15 payline video slot that is set on a flashy background, but trying to bring the old-school visuals that we're used to seeing on classic slots. This game manages to bring retro symbols including loads of different bar symbols, diamonds, gold and red 7s, and a bunch of annoying non-paying gaps between symbols that are the hallmark of ancient slot machines. Joining these symbols is a wheel of fortune styled scatter icon, which serves as the slot's bonus symbol.
This chance wheel bonus round is triggered when players manage to get three of the wheel icons on the 5 reels, with a giant wheel popping up on screen. The wheel will then spin and players are rewarded depending on where the selector ends up. These rewards include win multipliers and free spins. Joining the chance wheel are wild symbols (the diamond), which can boost your wins. The free spins round is the highlight of this game, so it is all the more shame that there is very little likelihood of hitting it on the chance wheel. Nevertheless if you do manage to trigger it, wilds become sticky and may expand until they cover a full reel, plus any chance wheel symbols will grant you and extra free spin.
Sadly, Play'n Go's layout here with the game doesn't pack a lot of action. You can go a long time in between the features hitting, which becomes frustrating. I think Play'n Go knows this, as they built in a feature where the chance wheel seems to come down randomly, and this triggers after you go on a long dry spell.
The combined line payouts and features give Big Win 777 a default return to player (RTP) rate of 96.5%, although operators can configure this to be as low as a nasty 84.5%, which is way too low. Make sure you check the RTP via the in-game help file before playing for real money at the casino you're playing at.
I will say that the slot plays well on mobile devices, which is great. The resolution and touch controls are both good, and it doesn't really differ from the desktop version. Personally, I think Big Win 777 is a boring affair, but your mileage may vary. Be sure to check it out before you play for real money.