Dr Zappo (Hacksaw Gaming) – Slot Review
Dr Zappo takes players inside a chaotic science-fiction laboratory, where eccentric experiments and futuristic technology create a colourful mad-scientist setting. The cartoon-style presentation keeps the atmosphere playful, combining scientific experimentation with plenty of unusual humour.
The reels are populated by ray guns, bombs, aliens and robots, alongside the eccentric Dr Zappo himself. However, the distinctive Eyeball Symbols are the real centrepiece, firing energy beams around the laboratory and bouncing off Energy Fields to transform symbols into Wilds.
The Eyeconic, No-Brainer and It’s Electrifying bonuses build further on the experimental theme, introducing increasingly powerful Eyeball interactions as the laboratory becomes progressively more chaotic. Overall, Hacksaw Gaming combines mad science, aliens, robots and bizarre experiments to give Dr Zappo a distinctive sci-fi identity, with its bouncing Eyeballs and electrical Energy Fields tying the theme closely to the gameplay.
Dr Zappo is played across 5 reels and 4 rows with 14 fixed pay lines. The game features medium volatility, an RTP of 96.31%, and a maximum win capped at 10,000x your stake. Bets range from £0.10 to £100 per spin.
Dr Zappo Symbols & Pay Table
There are 13 symbols in total. The five low-paying symbols are represented by 10, J, Q, K and A, while the five premiums feature Ray Guns, Bombs, Yellow Aliens, Robots and Dr Zappo himself. Special symbols include the Wild, Free Spins Scatter and Eyeball. Dr Zappo and the Wild are the highest-paying symbols, both awarding 6x for five across a payline. Wilds substitute for all regular paying symbols.
Dr Zappo Features & Mechanics
Wild Eyeball Symbols
The Eyeball Symbol is central to the gameplay and can only land along the bottom row of the grid. Once the reels have settled, each Eyeball activates from left to right and fires in one of three directions: straight upwards, diagonally left or diagonally right.
Every paying symbol caught in its path is transformed into a Wild. These newly created Wilds can either remain standard or reveal an additive multiplier ranging from 2x to 200x.
If an Eyeball strikes an existing Wild, that symbol receives a multiplier. Hitting an already multiplied Wild increases its value further by adding another multiplier, with additional values ranging from 1x to 200x. Once an Eyeball has completed its action, it also transforms into a Wild.
When multiple Wild Multipliers contribute to the same winning combination, their values are added together before the resulting multiplier is applied to the pay out.
Energy Fields
Three Energy Fields surround the left, upper and right edges of the grid, allowing Eyeball shots to bounce and continue travelling across the reels.
When an Eyeball reaches an Energy Field at an angle, it rebounds in another direction while continuing to transform paying symbols into Wilds. A direct hit causes the shot to travel back along its original path, potentially adding further multiplier values to Wilds it has already created.
Eyeballs can also interact with one another, with a direct hit adding a multiplier value to the affected Eyeball. These ricochets create opportunities for a single activation to influence multiple areas of the grid.
Eyeconic Bonus
Landing 3 Free Spins Scatters triggers the Eyeconic Bonus with 10 Free Spins. The standard Eyeball mechanics remain active, but Eyeball Symbols have an increased chance of landing. During the feature, landing 2 additional Scatters awards 2 extra Free Spins, while 3 Scatters award 4 additional spins.
No-Brainer Bonus
Landing 4 Free Spins Scatters activates the enhanced No-Brainer Bonus with 10 Free Spins. This feature retains the mechanics of Eyeconic but significantly improves the Eyeball mechanic. Every activated Eyeball now fires in two different directions on the same spin, creating more opportunities to transform symbols into Wilds and build additive multipliers. Landing 2 or 3 Scatters during the feature awards 2 or 4 additional Free Spins, respectively.
It’s Electrifying – Hidden Epic Bonus
Landing 5 Free Spins Scatters in the base game unlocks the It’s Electrifying Hidden Epic Bonus with 10 Free Spins. This enhanced feature retains the dual-direction Eyeball mechanic from No-Brainer while guaranteeing at least one Eyeball Symbol on every Free Spin. This provides consistent opportunities to generate Wilds, ricochets and increasingly valuable multiplier interactions. Free Spins Scatters cannot appear during the It’s Electrifying bonus, meaning the feature cannot be extended through additional Scatter landings.
Conclusion
Dr Zappo delivers an entertaining combination of Wild transformations, additive multipliers and ricocheting Eyeball mechanics, giving the game considerably more personality than a conventional payline slot. The Energy Fields are particularly effective, allowing Eyeball shots to bounce around the grid and potentially strengthen existing Wild Multipliers.
The three bonus rounds provide a good sense of progression, with No-Brainer introducing dual-direction Eyeball shots before It’s Electrifying guarantees at least one Eyeball on every Free Spin. With multipliers reaching 200x, a solid 96.31% RTP, and a 10,000x maximum win, there is plenty of potential when the mechanics combine successfully. Be sure to try out this game on launch and check out our exclusive casino offers.