Dr Zappo
Hacksaw GamingDemo
Free play · virtual balance · USD
Game information
Rules- RTP
- Up to 96.31%
- Bet
- 0.10100
- Max win
- ×10,000
- Layout
- 5×4
- Released
- Sept 2026
- Volatility
- 3 / 5
- Game type
- Slot
- Free spins
- Yes
- Bonus buy
- Yes
About these values
- Maximum win
- ×10,000
- Minimum bet
- 0.10
- Maximum bet
- 100
- Reels and layout
- 5×4
- Release date
- 29 September 2026
- Genre and theme
- Mad scientist · science fiction
- Features
- Free spins · Bonus buy
- RTP · configurations
- 96.31% / 94.36% / 92.31% / 86.22%
- Volatility
- 3 / 5
- Editorial category based on the artwork and developer description.
- Base-game field in the supplied version; columns × rows.
- The stated game version. Operator limits and feature availability can differ.
- Features of the stated version. Paid-mode availability depends on market and operator.
- Published reference base-game betting range; currency and casino configuration may differ.
Understanding the slot specifications
- Max Win
- The payout ceiling in the game rules, usually a bet multiplier. It is a limit, not a typical outcome.
- RTP
- The theoretical return over a very large number of rounds. A game may have different RTP versions; the percentage does not predict a session.
- Volatility
- The spread of outcomes. High volatility generally means sharper swings; it does not by itself increase RTP.
- Bonus buy
- Paid access to a bonus feature without waiting for the regular trigger. Price and availability depend on the game and version.
- Ante Bet
- A higher cost per regular spin for a changed chance of triggering a feature. This is a separate mode, rather than a bonus-round purchase.
- Respins
- Additional spins that may retain some symbols or accumulated conditions. The exact behaviour follows the slot rules.
Dr Zappo — game overview
Dr Zappo turns the grid into a laser experiment, with eyeball wilds firing through symbols and reflecting off energy fields.
Eyeballs, beams and wild transformations
Doctor Zappo and Mr Brain conduct another urban experiment. A wild takes the form of an eye firing a beam across the reels. Instead of simply landing a completed substitute, the game constructs its path first, making direction part of the combination that follows.
An Eyeball Wild creates substitutions along its firing path. The beam can travel upwards or diagonally, with energy fields changing direction. Hitting a wild or another eye again adds a multiplier, making the trajectory affect more than substitution count.
Opening screen1
How the bonus modes work
3 FS trigger Eyeconic with 10 free spins and more frequent eyes. 4 FS award 10 No-Brainer spins with eyes firing in two directions. 5 FS open It’s Electrifying: 10 free spins, each guaranteeing at least one Eyeball.
An eye firing in two directions can reach a different set of cells from an ordinary one. Meeting an existing substitute adds a boost, connecting the feature to both route and board state. A guaranteed Eyeball in the highest mode starts that action, while its path develops across the current arrangement.
Feature purchases and special spins
Zigzag Zappo guarantees at least two Eyeballs on one spin. Eyeconic and No-Brainer each purchase ten free spins. Eyeconic increases eye frequency, while No-Brainer lets each active eye fire in two directions.
Paytable and rules
Rules and paytable2
Common questions
Where can I check RTP and stakes?
In the running edition’s rules. Different configurations may use different parameters.
Are the feature and casino free spins the same?
The feature is part of the game mechanic. Casino promotional free spins have their own activation and usage terms.
Can I open a demo here?
Yes. Select “Launch demo” to load the game in the player. The demo uses a virtual balance; its language and supported currency follow the site language.