Iconic21

Knock Knock

SlotsVideo SlotsMysteryHumor

Choice-led Mystery game with a rising Multiplier trail

SlotRanker Score
52
/ 99
52
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%
return to player
Volatility
Adjusted
variance
Max win
2,000×
top multiplier
Min bet
$0.10
per spin
Reels
5
grid
Player rating
4.6 ★
4 votes
DEMO Play free, no signup
Iconic21
Knock Knock
Embed on your site
4.6 / 5
4 ratings
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User ratings are shown separately from the Slot Score unless stated otherwise.

Why this score

High confidence (86%)

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

Slot score profile across 5 weighted categoriesPayouts & RTP9/10RTP 96% → 9.0/10Volatility8/10imputedimputed medium…Win Potential6.6/10x2000.00 (2000×) →…Features1.5/101 features → 1.5/10Game Mechanics4.3/10f=1 r=5 → 4.3/10
Payouts & RTP9/10
RTP 96% → 9.0/10
Volatility8/10imputed
imputed medium (unknown) → 8.0/10
Win Potential6.6/10
x2000.00 (2000×) → 6.6/10
Features1.5/10
1 features → 1.5/10
Game Mechanics4.3/10
f=1 r=5 → 4.3/10
Context signals (tie-breakers)
Layout6/10
5x3 → 6.0/10
Bet Flexibility6/10
0.1–100 (×1000) → 6.0/10
Provider Reputation4.9/10
provider avg 4.9 → 4.9/10
Popularity0/10
synthetic proxy → 0.0/10

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: 52 — Knock Knock by Iconic21

https://slotranker.com/iconic21/knock-knock#score
How to cite

Slot Summary

A five-reel format gives Knock Knock a familiar starting shape, but the documented play loop shifts attention from symbol matching to a sequence of doors. Iconic21 asks the player to open another door for a higher Multiplier or collect the current return before a losing reveal ends the round. That repeated decision fits the Mystery label directly, while the x2000.00 ceiling defines how far the risk can run.
MechanicsOpen another door or collect the current return

How It Plays

A round advances one door at a time. A successful reveal raises the available return, then presents the same decision again: collect it or continue.

Three documented difficulty settings change the number of doors, the chance of a successful reveal, and the steepness of the Multiplier increases offered along the route.

Theme & Atmosphere

Mystery comes from the closed-door sequence, since the result remains concealed until the player commits to opening the next point on the trail.

Humor enters through the Knock Knock title and familiar joke setup, but the repeated collect-or-continue decision gives that premise a sharper risk-based purpose.

MysteryHumor

Features & Win Potential

The Multiplier increases after successful doors, creating a visible trail whose next value must be weighed against the possibility of losing the uncollected return.

Because collection is optional after each success, the Multiplier acts as both the reward measure and the reason to continue opening doors during the same round.

Multiplier
Spec sheet
Knock Knock at a glance.
Identity
Slot nameKnock Knock
StudioIconic21
Released8/11/2025
Math
SlotRanker Score52
RTP96%
VolatilityAdjusted
Max win2,000×
Bet range$0.10 – $100.00
Player rating4.6 / 5 · 4 votes
Format
Reels5
Paylines—
Layout5x3
Features
Multiplier
Themes
MysteryHumor

True Cost to Play

Expected average based on this slot's 96% RTP — individual sessions vary with volatility.

Cost per hour$1.60
Cost per session$1.60

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

Bankroll survival simulator

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

Volatility tier: Mediumassumed — not published for this slot

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 (Medium). The model is calibrated so the average return equals this slot's published RTP (96.00%), with wins capped at its top multiplier (2,000×).

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 Knock Knock

No matching casinos for your region yet

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

Compare Knock Knock with other games

Knock Knock
Knock Knock
Score 52This game
Inspector GadgetInspector Gadget
Score 83
Dwarfs Gone WildDwarfs Gone Wild
Score 75
The CatfatherThe Catfather
Score 68
Mission CoinpleteMission Coinplete
Score 89
Identity
Studio
Iconic21
Blueprint Gaming
Quickspin
Pragmatic Play This provider has been reviewed and approved by the SlotRanker team. What does this mean?
Fantasma Games
Released8/11/20254/9/20186/12/20183/15/2016—
Math
RTP96%96.49%96.38%96.52%96.22%
VolatilityAdjustedMedium volatilityMedium volatility—High volatility
Max win2,000×————
Format
Reels55555
Layout5x35x45x35x35x3
Paylines—50309Cluster
Min bet0.10.20.20.90.1
Max bet10020010045300
Features
Progressive—————
Wild symbol—✓✓✓✓
Free spins—✓✓✓✓
Scatter symbol—✓✓✓✓
Multiplier✓✓✓—✓
Bonus game—✓✓—✓
Respins—✓✓——

Every number is shown as a delta against Knock Knock.

Knock Knock
Comparing against
Knock Knock
Iconic21
RTP
96%
Max win
2,000×
Score
52
Inspector Gadget
Inspector Gadget
Blueprint Gaming
RTP
96.49%▲+0.5
Volatility
Medium volatility
Max win
—
Score
83▲+31
+ Wild+ Free Spins+ Scatter+ Bonus Game+ Respins
Dwarfs Gone Wild
Dwarfs Gone Wild
Quickspin
RTP
96.38%▲+0.4
Volatility
Medium volatility
Max win
—
Score
75▲+23
+ Wild+ Free Spins+ Scatter+ Bonus Game+ Respins
The Catfather
The Catfather
Pragmatic Play
RTP
96.52%▲+0.5
Volatility
—
Max win
—
Score
68▲+16
+ Wild+ Free Spins+ Scatter− Multiplier
Mission Coinplete
Mission Coinplete
Fantasma Games
RTP
96.22%▲+0.2
Volatility
High volatility
Max win
—
Score
89▲+37
+ Wild+ Free Spins+ Scatter+ Bonus Game

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Questions & Answers

Knock Knock FAQ

4 questions

After a successful door, the player chooses between collecting the current return and opening another door for a higher Multiplier.

A losing reveal ends the active round and removes the uncollected return accumulated along the Multiplier trail.

The documented game offers three difficulty settings that alter the door sequence, success rate, and available Multiplier increases.

Knock Knock has 96% RTP and a listed maximum win of x2000.00.

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