Book of Conquistador Slot by Endorphina

The world here is sun-drenched. The reels sit in an ornate carved-gold border against a jungle valley, stone temples and stepped pyramids climbing the hillsides behind in warm haze, the palette all gold, jungle green and weathered stone. The symbols are the cast of a lost-city hunt: a bearded Spanish conquistador, a fierce Aztec warrior, a native woman, a golden sun-mask, a stone pyramid, plus the treasure trinkets, an emerald ring, a jewelled gold necklace and stacks of coins. Anyone who has played an Aztec treasure slot knows the shape of this immediately.

The map-and-compass book does double duty. It's the wild, standing in for every paying symbol, and it's also the scatter, paying from any position and triggering the bonus when three or more land. Line wins and scatter wins both count on the same spin. Land three scatters and you get 10 free games, but the round runs differently from a normal book bonus. Before the spins begin, books cover the symbols and you pick one. Whatever is hidden underneath becomes the special expanding symbol for the whole round.

From there it's about volume, not placement. Once enough of your chosen symbol are on the reels to form a paying combination, count being the only thing that matters, they expand vertically to fill their reels and pay across any position, adjacent or not, on the active lines. That payout lands after the regular symbols resolve. The book wild keeps subbing during the round, with one restriction worth knowing: it will not stand in for the special symbol, so the bonus lives or dies on how often your pick actually shows up. The 10 spins retrigger, and a generous symbol drawn early can snowball toward the 6,000x ceiling.

The Bonus Pop button buys straight into the free games, and unlike most buy features it lets you choose which symbol expands rather than leaving it to the draw, a real edge if you want a high-pay premium doing the filling. Whatever you win in a bought round can't be sent to the gamble, though. That gamble is a card guessing game, beat the dealer's card to double, up to ten times in a row, with a joker that trumps everything. Sitting over all of it are three network progressive jackpots, Grand, Major and Minor, drawn at random with higher bets improving your odds. Endorphina has built a long line of these book slots, and if you've spun something like Raiders of the Lost Book, the pick-your-symbol bonus will feel like home.