The Curious Machine slot from Betsoft is by far one of the most detailed and breathtaking games that this software developer has ever created. Even better, players who do not want to spend their money to experience everything that the game has to offer can play it as a free slot at various venues. Before spinning the reels, players will need to determine how many paylines upon which they want to wager, the value of the coin, and the number of coins per payline to wager. There is also a 'max bet' option that will allow players to automatically bet the maximum amount allowable for the game. Unlike other games from Betsoft, this one comes with the Double-Up bet option. After each win, players can choose whether or not to participate in a side game that can either double or forfeit all of their winnings for that spin.
The Vortex is the wild symbol in The Curious Machine; it substitutes for all other icons except for scatter symbols. It also 'whips up' the winning icons and completely changes their positioning, so there is a chance that additional winning combinations can also be created. A second-chance reel rewind is another neat feature in this game. Though all 30 paylines must be active to use it, it will rewind any one of the five reels to provide players with a second chance to win. The free spins feature is triggered by three or more dinosaur icons, and a 1x to 5x multiplier is applied to each one. Three or more scatters on the screen at any time will award instant prizes during various animations.