The game is played on a standard 5x3 board with 20 paylines, and all the usual things you find in classic slots can be found in La Gran Aventura as well. The game has four card symbols which don't pay much, as well as four more symbols in this range, the four items of the explorer gear. It's the cast of three main characters that pay a significant prize of 500 coins for five-of-a-kind, while Wild and Bonus Scatter symbols pay 1000 and 1100 respectively.
Landing three or more Bonus Scatter symbols will trigger the free spins game, and the reward is always 10 free spins, regardless of the number of Scatters. At the beginning of the feature, the player chooses one of the three explorer characters, and that symbol will be held whenever it occurs on the reels, and will pay and function as a Wild. This can make the bonus feature very rewarding, but only if the Wilds add up on your reels.
The theme is not bad for a classic slot game, though it lacks a symbol that would be the focus of the entire game. The Bonus Scatter is dominant, but it's the explorers that should have stood out more. In general, the theme will satisfy classic slot game players but will offer little to attract a player who's used to slot which make better use of modern graphics.
The game as a whole offers only one thing, and that's the anticipation of the free spins game. The base game only serves as a vehicle to get to the bonus game, which is where all the big prizes are hiding. Theoretical payout of the slot is 94.93%, which won't be enough to satisfy the more demanding players.
La Gran Aventura does what a classic slot is supposed to do – offer high variance and a generous prize hidden behind the bonus feature. Maximum possible prize is 100,000 coins so that's something to look forward to, and it will take many, many Wilds during the free spins game to reach these numbers. It's difficult to beat La Gran Aventura unless the playing session is long enough to get a rewarding instance of the free spins feature.
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