Become an explorer and join the adventure! Unveil the riches of an ancient civilization and find the hidden mystery bonus prize. During normal play "Adventurer" only appears on reels 1, 3 and 5 and substitutes for all symbols except scattered "Tablets". Prizes double when 1 or more appear in a winning combination. Hidden Riches offers three bonus features – Free Games Feature, Mystery Prize and a Bonus Round. 5 or 25 free games are awarded when 2 or 3 Adventurers appear, respectively. All prizes are tripled during free games. The feature can be retriggered. The "Adventurer's Circle" is revealed whenever 3 or more scattered Tablets appear anywhere. The circle has 5 prize symbols and a Bonus Round! Also, at anytime you may win the randomly-awarded progressive jackpot!