Where Iron Man game is concerned, I like Iron Man 3 the best. I don't like the expanded symbols in Iron Man 2, which causes a lot of confusion, to me that is, but King Of Olympus has avoided all that and maintained the traditional single-size symbols for simplicity. I like this. It also means that King Of Olympus may replace all the 3 versions of Iron Man with just this one game, but I'm okay with that. Don't know about other Playtech fanatics though.
Zeus is the Wild symbol, 5 of which pays 3000x the line bet, it substitutes for other symbols except for the Scatter symbol, but doesn't become stacked or expanded, just as in Iron Man 2. Still, it's a dumb Wild symbol to me. The name 'Zeus' is the Scatter symbol, paying 100x the line bet for 5 of them, and getting 3 or more of them triggers 10 free spins with Increasing Multipliers after every 2 free spins. The starting multiplier is 2x, has a locked Extra Wild symbol in the center of reel 3 for every free spin, but the Free Spins game cannot be retriggered, which is a sore point to me, because this reduces a lot of winning chances. All the other symbols pay from 1000x to 30x the line bet for 5 of each kind, making the paytable a low one. I don't quite like this bit, hence Iron Man 2 was never one of my favourite Marvel games, and the same would go for King Of Olympus too. Personally, I would prefer this game to replace Iron Man 3 instead, which has a better paytable.