Zeus: My Opinion
The Zeus slot features a free spin bonus triggered by getting 3 or more of the blue lightening symbols anywhere in view. If you get 3 of them, you get 10 spins, 4 is for 25 spins and get all 5 and you're in for a real serious payday - 100 free spins! The Zeus slot also features stacked Zeus symbols - this is what you really want for big payouts and when you get the freespin bonus not only does Zeus add more of these to the reels, but it also stacks the Wild symbols.
The Zeus slot has the same game-play as the online versions of Palace Of Riches and Samurai Master so if Zeus is running cold and you want to stick with the same type of game, those are good bets. Also, the newer Kronos slot works along similar lines but with a left-to-right payline twist. Watch out for Zeus II when it comes online too - one of WMS's very popular land-based "Super Respin slots" (check out the Griffins Gate slot to see), and very distinctive.
If you go to Vegas, you will hear WMS games long before you see them! Even the newer G+ Deluxe games and Colossal Reels slots like Spartacus have a very distinctive audio footprint, Check out the other WMS slots that are also now available to play online including Spinning Streak, Money Burst and Hot Hot Penny games and also the Zeus 3 slot which is also now online (they skipped the Zeus 2 Super Respin game for some reason).