When you get a full reel of wild symbols on the main left reels this occurs on the corresponding reel on the Colossal reel set to the right, triggering the entire reel with fire, turning that reel completely into wild. This mode appears quite often during game and I like that. I think it can provide some big winnings, but I never had any. Most of the time my winnings were around x10 to x20 my bet.
There is also free spins feature. 3 scattered symbols award you with 8 free spins, 4 scatters with 12 and 5 scatters with max 20 free spins. I triggered only once free spins with 3 scatter symbols and from those 8 free spins I won a little less than x40 bet.
Kiss video slot can provide some decent, big winnings. But to get them you will need to have more than 2 reels completely into wild. I think the payouts could be a little better when you get 2 entire wild reels. Otherwise the game is quite good, but I do not like the graphics here so much. The game is quite old. I am not so sure if I will play it again, mostly because there are many better games powered by WMS software provider. I like their games, but I guess Kiss just isn’t for me. I tried it and I do not like it so much. Beside that free spins feature is very hard to get, I played it for a long time and I triggered free spins only once.