What is ZillaRank?

ZillaRank is a player-driven metric that provides data-focused coverage of the iGaming industry’s most popular games. First and foremost, ZillaRank represents a best-in-class analysis product for the latest releases spanning countless themes, genres, in-game features, and more. Games are rated against deep criteria, allowing our team to assimilate a list of the most lucrative and beloved slots in today’s market.

Unlike other slot-ranking systems you may have seen elsewhere, ZillaRank hones in on verifiable player activity. We don’t just accumulate and rate slots – we account for player preferences, feedback and relevance in the modern scene.

All rankings are based exclusively on publicly verifiable player behaviour, compiled using real-time data collection across regulated operators. No game can purchase or manipulate its rank in our system.

How Is ZillaRank Calculated?

01

ZillaRank accounts for a wealth of critical game-related factors, providing real-time results for players. Each slot is weighed against a carefully curated list of core game attributes relevant to modern users, with seven central elements at the heart of this tool.
02

All seven attributes are ranked by their significance to players. The more important a particular facet, the greater its impact on the game’s final ranking. Once all main aspects are totalled up, the game receives a ZillaRank score.
03

This score is designed to reflect the overall entertainment value, provable fairness, holistic payout potential, and the quality of the experience provided to players by the game.
04

To accurately tailor ZillaRank scores to players within each of our dedicated markets, we utilize unique calculators based on every region to assemble an authentic list of the most impressive games within that locale.
05

For example, while the UK and Germany may have the same games, players based in Britain might prefer a specific genre type over their German counterparts. As such, ZillaRank is developed to cater to a wide range of player interests within each region.
06

Our quest to present clear-cut ratings culminates in a consistently refreshed shortlist of the day’s best games, and points are credited based on the slot’s parameter-based performance. The lower the number associated with the slot, the higher the game’s quality.
07

In effect, a slot ranked ‘1’ is held in higher regard than a game numbered ‘10’, and so on. This results in a refined record of the slot industry’s finest output, all available for free at Slotozilla.
08

To objectively evaluate each slot, we use a special formula that takes into account key game parameters.
SR=W1*RTP+W2*V+W3*FR+W4*MW+W5*TS+W6*PR +W7*TGS
09

No two games are the same, and this is drawn out in our comprehensive analytics-centric scoring system for new and popular slots.
10

We implement an in-depth formula to better understand which slots are held in the highest regard by players, as well as which ones fall short of expectations. To ascertain where a slot sits on this scaled system, we contrast the game’s performance across the following seven touchpoints.

Key Criteria Descriptions

RTP (Return to Player)

This represents the amount of money a slot is expected to pay out over an extended play session, with games scored from 0% to 100%. Most games sit in the 95%+ region, which equates to around 95£ being paid out per £100 wagered. As RTP determines projected player returns, this metric carries significant weight in our scoring process.
V (Volatility)

Generally rated as low, medium, or high, volatility outlines the risk level associated with a slot game. Titles on the ‘high’ end of the scale will see fewer wins, while ‘low’ volatility releases pay out more regularly. ZillaRank incorporates an inverse scoring framework for this metric to showcase that ‘higher’ volatility delivers unpredictability.
FR (Feature Rating)

Most online slots comprise bonuses, multipliers, free spins and other special in-game boosts that seek to reward players during a play session. Often, these accoutrements are dubbed ‘features’ – and ZillaRank compiles bonus-adjacent information to accurately rank in-game perks. Higher scores translate to more rewarding bonus functionality.
MW (Maximum Win)

Although slots are devised with player winnings in mind, certain games integrate maximum win limits. This is generally included to reduce variance and protect operators. In terms of ZillaRank, this component earns increased ratings when linked to generous returns. Games that restrict users to limited ‘maximum win’ payouts are marked down on our scoring system.
TS (Slot type)

Slots traverse a breadth of themes, genres and payout options – all in the name of ingenuity and innovation. Progressive slots stand as the most profitable option for modern bettors. This game type adds continuous cash to the jackpot upon each spin, building to a crescendo upon the final payout. As a result, progressive jackpot slots garner more points on our scale than other verticals.
TGS (Theme, graphics and sound effects)

An all-new parameter devised to pay homage to the quality of graphics, thematic authenticity and in-game sound effects – ‘TGS’ supplies imperative information as to the immersion of a slot game. Between jolly jingles, atmospheric content and a game’s dedication to the supposed theme, there are ample threads to pull from here. While ‘TGS’ does not quantify a player’s potential winnings, it does establish solid context for the game’s holistic merit.
Provider Reputation (PR)

Certain software providers are renowned for high-performance graphics, others earn plaudits for payouts, and some contribute the most impressive in-game features on the market.

Reputable software providers reside within multiple regions, with top-rated teams licensed by recognized regulatory authorities. As unlicensed groups may have a propensity to mislead players, we regard ‘provider reputation’ as the second most important metric to account for when comparing slots.

The importance of parameters in the formula

RTP

9.0/10
Volatility (Inverse)

7.0/10
Feature Rating

8.5/10
Max Win (Log Scale)

6.3/10
Slot Type

5.0/10
Provider Reputation

8.0/10
Theme/Graphics/Sound

5.5/10

The weighting factors w_i are determined empirically.

Criterion	Designation	Recommended weight
RTP	W1	0.25 (25%)
Volatility	W2	0.10 (10%)
Features	W3	0.2 (20%)
Maximum Win Potential	W4	0.10 (10%)
Slot Type (Progressive/Standard)	W5	0.05 (5%)
Provider Reputation	W6	0.15 (15%)
Theme/Graphics/Sound	W7	0.15 (15%)
Total	—	1.00 (100%)

RTP (0.25) is the main financial parameter for conscious players.
Features (0.2) and Theme/Graphics/Sound (0.15) are important for visual appeal and gameplay enjoyment.
Provider Reputation (0.15) is a game from a good provider = trust + quality.
Volatility (0.10) is important for a sense of balance in the game.
Max Win (0.10) motivates risk-takers.
Slot Type (0.05) is less important for the average player, but is taken into account.

Add example

ZillaRank has already been put to the test in the real world, as our experts calculated a final rating for Pragmatic Play’s hit slot game, Gates of Olympus.
Following all seven criteria, we found that Gates of Olympus is a top choice for contemporary bettors. The game scores impressively across all metrics, including RTP, features, design and provider reputation.
Although Gates of Olympus was marked down for a limited maximum win limit (5,000x), the game remained strong throughout virtually all other parameters.
After reviewing this slot and comparing it with others on the market, Gates of Olympus clearly outperforms most titles available today.
Whether you’re after high-quality performance, leading graphical fidelity, consistent payouts, or all-around entertainment, Pragmatic Play’s popular slot provides all in abundance.

Gates of Olympus

by Pragmatic Play

ZR:

RTP: 96.51%

Gates of Olympus, a creation by Pragmatic Play, invites players on a mesmerizing journey into the heart of ancient Greek mythology. Released in February 2021, it remains a favorite among slot enthusiasts. If you enjoy grid slot games, this machine is an excellent choice, offering high volatility and an RTP of 95.51%. Let’s delve deeper into this slot in our Gates of Olympus review. How to Play Gates of Olympus? Gates of Olympus is a thrilling online slot game that immerses players in a mythical adventure through ancient Greece. To start winning real cash, simply land 8 or more matching symbols simultaneously on the reels. Here’s a detailed guide: Choose a reputable online casino offering the game. Set your bet amount. Begin your quest by spinning the reels. Explore the tumble feature, where winning symbols disappear, and new symbols slide down to fill the gaps. Experience the excitement of the free spins feature, triggered by landing four or more golden sun symbols, awarding 15 free spins. In Greek mythology, Olympus is the highest mountain and the home of deities like Zeus, Athena, Poseidon, and Aphrodite. The Gates of Olympus slot takes players to the summit of Mount Olympus, showcasing a majestic marble palace and Zeus’ throne. The God of Storms occasionally casts spells, ensuring players win big with lightning bolts striking the reels.

Gates of Olympus

Pragmatic Play

ZR:

RTP: 96.51%

Criterion	Score (0–10)	Notes
RTP	9.6	96.5% RTP delivers consistent payouts
Volatility	8.7	High volatility (only major shortcoming)
Max Win	5.0	Tumbles, multipliers, free spins
Slot Type	2.6	5,000x max win
Provider Reputation	8.6	Standard slot
Theme/Graphics/Sound (TGS)	6.9	Pragmatic Play is a licensed and reputable studio
Total	—	Highest among all reviewed titles → Rank: 1

Best Slots by ZillaRank

FAQs

How often is ZillaRank updated?

Slotozilla’s ZillaRank is updated once per month to provide a consistent rundown of your region’s best games.

Can I trust ZillaRank?

Yes, it weighs safety as a major factor within its criteria, making it one of the most trustworthy slot rating systems available.

Why is a lower ZillaRank score better?

Being ranked ‘1’ on the ZillaRank rating board means that particular game is the best slot on the current market. Thus, the lower the score, the better the game.

Does ZillaRank guarantee wins?

While ZillaRank does not guarantee payouts, this rating protocol provides helpful context for how often players can expect a rewarding experience.

How can I find the best-ranked slots in my region?

Each of the top-rated slots in your region is ranked on this page. The list is automatically updated based on local popularity, player activity, and availability.

Is ZillaRank influenced by sponsorships or paid placements?

This is a data-driven, expert-led slot rating system determined solely by the quality of games in the modern industry.