Wilds substitute for all paying symbols and count as the symbol which forms the longest winning combination on a single win line.

At the start of a spin, Brains may appear in the Brain Tube above each reel. Brains may hold a random multiplier of x2, x3, x4, x5, x6, x7, x8, x10, x12, x15, x20, x25, x33, x44, x55, x66, x77, x88 or x99. When a Wild lands on a reel below a Brain, the Wild expands to cover the whole reel and the Brain is added to it. If the Brain has a multiplier, the Wild receives that multiplier. The Wild multiplier applies to any wins in which the Wild participates. If multiple Wilds with multipliers participate in the same winning line, their multipliers are added together. Two special Brain types may also appear in the Brain Tube: Collector Brain and Donor Brain. Their features are triggered before any Wilds are expanded. Donor Brains always hold a multiplier. Each Donor Brain adds its multiplier value to all regular Brains and Collector Brains currently in the Brain Tube. Collector Brains collect the multiplier values from all regular Brains currently in the Brain Tube and add those values to their own multiplier. If both Donor Brains and Collector Brains appear in the same spin, all Donor Brains are triggered before any Collector Brains.

Landing 3, 4, 5, or 6 Scatter symbols triggers 12 Free Spins. In Free Spins, all Brains in the Brain Tube have a minimum multiplier. The starting minimum multiplier is based on the number of triggering Scatters: x2 for 3 Scatters, x5 for 4 Scatters, x10 for 5 Scatters, and x20 for 6 Scatters. After any spin in which one or more Brains are added to Wilds, the minimum multiplier increases by one step to the next available Brain multiplier value for the remaining spins. The minimum multiplier cannot increase beyond x99. Free Spins have 3 progression levels, represented by Conical Flasks. Each Scatter symbol that lands during the bonus round increases the progress of the current Flask by 1. Each Flask is filled after collecting 3 Scatters. Filling a Flask awards 5 additional spins and upgrades the bonus round as follows: Level 1 - At least 1 Brain is guaranteed to appear in the Brain Tube on each spin. Level 2 - At least 2 Brains are guaranteed to appear in the Brain Tube on each spin, with one guaranteed to be a Collector Brain. Level 3 - At least 3 Brains are guaranteed to appear in the Brain Tube on each spin, with one guaranteed to be a Collector Brain and another guaranteed to be a Donor Brain. A maximum of 3 Scatter symbols can land during the bonus round. Scatters cannot land after completing level 3.

The maximum win amount is limited to 12,500x the current stake. If the total win for a game round reaches that amount, the round immediately ends, the maximum win is awarded, and any remaining Free Spins are forfeited.

The following features can be bought in the game: 1) Bonus Chase - The chance for landing Scatter symbols and entering the bonus round is 5 times greater. 2) Brain Chase - 2 Brains are guaranteed to appear in the Brain Tube on each spin and the chance for landing Wilds is 2 times greater. 3) Free Spins - 3 or more Scatter symbols are guaranteed to land and trigger the Free Spins bonus round. The minimum Brain Multiplier in the bonus round starts at x2 or higher, depending on the number of triggering Scatter symbols. 4) 4 Scatters - 4 or more Scatter symbols are guaranteed to land and trigger the Free Spins bonus round. The minimum Brain Multiplier in the bonus round starts at x5 or higher, depending on the number of triggering Scatter symbols. 5) 5 Scatters - 5 or more Scatter symbols are guaranteed to land and trigger the Free Spins bonus round. The minimum Brain Multiplier in the bonus round starts at x10 for 5 Scatter symbols and x20 for 6 Scatter symbols.