Thunderkick

Zap Attack

Slots Video Slots Action & Adventure Retro UFO Cartoon Sci fi Tv

Small-town alien comedy with multiplier-driven win potential

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

96.17%

return to player

Volatility

High volatility

variance

Max win

5,000×

top multiplier

Min bet

$0.10

per spin

Reels

25 lines

Player rating

3.7 ★

6 votes

DEMO Play free, no signup

Thunderkick

Embed on your site

3.7 / 5

6 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP9/10

RTP 96.17% → 9.0/10

Volatility9/10

high → 9.0/10

Win Potential7.4/10

x5000.00 (5000×) → 7.4/10

Features10/10

21 features → 10.0/10

Game Mechanics4.7/10

f=21 r=5 p=25 → 4.7/10

Context signals (tie-breakers)

Layout5/10

5x4 → 5.0/10

Bet Flexibility6/10

0.1–100 (×1000) → 6.0/10

Provider Reputation7/10

provider avg 7.0 → 7.0/10

Popularity7.5/10

synthetic proxy → 7.5/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 79 — Zap Attack by Thunderkick

https://slotranker.com/thunderkick/zap-attack#score

How to cite

Slot Summary

Lighthearted sci-fi and high-volatility play meet in Zap Attack, Thunderkick's cartoon invasion of the town of Roswealth. Its identity comes from making the attackers part of the payout system: invading wilds amplify wins, while the free-spins round turns the town's inhabitants into higher-paying aliens.

How It Plays

Wins are evaluated on 25 paylines rather than by counting matching symbols anywhere on the screen. Stacked symbols can occupy multiple positions, while ordinary wilds substitute in paying combinations.

The alien is the highest-paying regular symbol and can pay with two matches. Human characters sit below it in the paytable, giving the bonus round specific symbols to upgrade.

Theme & Atmosphere

Roswealth is a fictional small town facing a UFO invasion. Thunderkick presents the attack as cartoon comedy, with everyday townspeople supplying the human side of the conflict.

The setting draws its personality from the clash between ordinary local life and extraterrestrial attackers. A sheriff, waitress, and elderly resident give the invasion a recognizable small-town cast.

Action & Adventure Retro UFO Cartoon Sci fi Tv

Features & Win Potential

An Invading Wild can stretch across its entire reel and apply a multiplier of up to 5x. When several participate in one win, their multipliers multiply together.

Zap Attack has high volatility and a maximum win of 5000x the stake. That ceiling limits the final payout even when several wild multipliers combine in the same winning line.

Bonus & Free Spins

Landing 3, 4, or 5 scatters awards 7, 11, or 15 free spins respectively. The different trigger sizes therefore change the starting length of the Bonus Invasion round.

During free spins, alien shots accumulate against human characters on an upgrade ladder. After 10 hits, a character becomes the higher-paying alien and the round receives an additional free spin.

Spec sheet

Zap Attack at a glance.

Identity

Slot nameZap Attack

StudioThunderkick

Released9/1/2023

Math

SlotRanker Score79

RTP96.17%

VolatilityHigh volatility

Max win5,000×

Bet range$0.10 – $100.00

Player rating3.7 / 5 · 6 votes

Format

Reels5

Paylines25

Layout5x4

Expected average based on this slot's 96.17% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$1.53

Cost per session$1.53

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Zap Attack? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: High

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (High). The model is calibrated so the average return equals this slot's published RTP (96.17%), with wins capped at its top multiplier (5,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Zap Attack

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Casino availability depends on where you play from. We only show casinos that accept players from your country.

Compare Zap Attack with other games

	Zap Attack Score 79This game	Thundercats Score 75	Monster Wins Score 81	Alien Wins Score 76	Galactic Girls Score 73
Identity
Studio	Thunderkick	Blueprint Gaming	NextGen	Realtime Gaming	Eyecon
Released	9/1/2023	8/16/2017	6/22/2016	5/17/2024	8/18/2020
Math
RTP	96.17%	95.5%	97.12%	—	96.62%
Volatility	High volatility	Medium volatility	High volatility	Medium/High	High volatility
Max win	5,000×	—	—	50,000×	125×
Format
Reels	5	5	5	5	5
Layout	5x4	5x4	5x4	5x3	5x6
Paylines	25	30	1024	10	7776
Min bet	0.1	0.4	0.5	0.1	0.1
Max bet	100	500	100	2.5	20
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	—	✓
Scatter symbol	✓	✓	✓	—	✓
Multiplier	—	✓	—	✓	✓
Bonus game	—	✓	✓	—	—
Respins	—	—	—	✓	—

Every number is shown as a delta against Zap Attack.

Comparing against

Zap Attack

Thunderkick

RTP

96.17%

Max win

5,000×

Score

+ Multiplier+ Bonus Game

+ Multiplier+ Respins− Free Spins− Scatter

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01Does Zap Attack pay for clusters?

Zap Attack evaluates wins on 25 paylines. Matching symbols scattered elsewhere do not form a separate cluster payout.

02Can upgrading a character add a free spin?

Yes. Completing a character's upgrade changes it into the alien symbol and awards an additional free spin.

03Can Zap Attack's free spins be purchased?

The game includes bonus-buy options offering different starting scatter counts and free-spin allocations. Availability depends on the version offered.

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