Hercules is the wild symbol. He can land on reels two, three and four substitute for all the other symbols, except the scatter and bonus symbols.
The games logo is the scatter symbol and in addition to offering scatter payouts of up to 100x the total bet, it can also trigger the free spins.
The Herculean Strength feature can be triggered on any spin and there are two versions of it. If Hercules lands in the centre of the third reel you receive two respins with the wild symbol expanded and frozen in place. If you land Hercules anywhere on reels two, three and four simultaneously you receive one free respin with all three wilds expanded and frozen in place.
The Hydra Bonus begins if you land the Hydra bonus symbol on reels one and five simultaneously. You are taken to a screen showing Hercules preparing to battle Hydra. You need to pick three heads to fire arrows at in exchange for cash prizes and then a fourth head for a multiplier. If you are lucky the Hercules Rage feature may trigger and explode all of Hydra's heads.
The free spins are triggered by landing three or more of the Hercules scatter symbols anywhere on the reels. You are awarded ten free spins that can be retriggered. During the free spins all wins are tripled and it is possible to trigger the Herculean Strength feature.
The slot is also linked to the Age of the Gods progressive jackpots. The jackpot game can be triggered at random after any spin. You are shown a grid covered in gold coins and need to click on them to reveal their faces. Each coin represents one of the four progressive jackpots on offer and when you find three matching coins you win the corresponding jackpot. The four jackpots on offer are: Ultimate Power, Super Power, Extra Power and Power.
In addition to the progressive jackpots, Prince of Olympus offers a top fixed payout of 4,000x for landing five Cerberus symbols across a payline. The golden fruit can payout up to 500x and the club and green jewel symbols can both payout up to 200x.