TThunder King has 30 paylines, which is higher than the 20 or 25 you'll find in lots of Aristocrat titles but not as many as the 243 ways to win offered in the Reel Power system. All in all, it feels about right, and you do usually experience enough decent-sized wins during standard play.
Triggering the bonus round is tricky, as you need to land three scatter symbols on adjacent reels. Personally, we feel like this defeats the whole idea of a "scatter" symbol, but maybe we're just being purists. The bonus round is well worth it when you do manage to trigger it, with between 10 and 20 free spins available depending on how many Mount Olympus symbols you landed to set it off.
There's no multiplier but every time you land a Zeus symbol, he turns an entire reel wild. This is a little frustrating when he turns, say, the fourth and fifth reels wild and it makes no difference to your win but it's an absolute godsend (pun intended) when he turns one or more of the first two reels wild and lands you a load of wins.