Written by Ryan Mitchell· Reviewed by Mark Rylance· Published 6 April 2026 · Updated 24 April 2026 · 3 min read
Extra Reels games add unlocked reel sets, expanded grids or extra pay areas to raise hit potential. In 2026, the catalogue covers 25 titles, with free demos and no sign-up for proper high-stake testing.
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Extra reel mechanics increase the active play area through added reels, expanding reels or unlockable reel arrays, with some studios using branded names for the same idea. I rate the mechanic because it changes the value of each bonus stage rather than adding cosmetic noise. Small stakes never do this mechanic justice; at 100 pounds a spin the feel is a different beast.
How the added reels pay
Added reels usually appear after a trigger, during Free Spins, or inside a paid feature round where legal. More reels mean more paylines, ways, symbol positions or modifier space, depending on the slot. Scatter hits, Wild expansion and Multiplier growth matter far more once the layout widens.
I prefer versions where reel expansion is tied to clear paytable rules, not vague bonus wording. Money Train 3 and Money Train 4 show why space matters in a feature grid, while Valley of the Gods 2 leans harder into multiplier pressure. The multipliers take on a whole new dimension once extra positions stay active.
Relax Gaming carries the most aggressive high-ceiling feel through Money Train 3 and Money Train 4, with the latter widely known for a 150,000x stated max win. I also keep Jurassic World, Thunderstruck Wild Lightning and Immortal Romance in the comparison set when I want older Microgaming pacing against newer feature density.
Maths, RTP and bankroll pressure
Across the category, the average RTP sits at 95.78%, which is usable but not generous by sharp-player standards. I treat anything below 96% as a tax on long sessions, especially when the bonus cycle is dry. The average max-win figure of 18,215x is only a broad pointer; individual paytables matter more than that blended number.
Five thousand pounds is my minimum serious test envelope for this mechanic, and I sank five grand into testing the round properly before forming a view. You feel the volatility far more when the stake is up, but on high stakes every retrigger really counts. One clean trigger and you are deep into four figures, provided the expanded area stays alive.
FAQ
What is an Extra Reels slot?
An Extra Reels game adds more active reel space during play, usually through expanded reels, unlocked columns or a wider bonus grid. Money Train 4 and Valley of the Gods 2 show why extra positions can change the value of Multiplier and Free Spins features.
On how many games is Extra Reels available?
Catalogued coverage is 25 games in 2026. The group is provider-led, with Yggdrasil, Microgaming and Relax Gaming carrying much of the serious high-stake interest.
Can you play Extra Reels games for free?
Free demos are available with no sign-up, so bankroll testing can happen before any deposit. I would use demo mode to check whether the added reels appear often enough for your session style.
What is the average RTP for these games?
The category average RTP is 95.78%, which is slightly lean for long high-stake sessions. Check each paytable, because Money Train 3, Thunderstruck Wild Lightning and Vikings Go Berzerk do not price volatility in the same way.
Are Extra Reels games very volatile?
Most games with extra reel space lean towards high volatility because the stronger outcomes sit inside expanded bonus rounds. At £50 or £100 a spin, dry stretches hit hard, but the larger active grid can justify the pressure when retriggers and multipliers connect.
All our content is written by our editorial team and checked before publication. We play the games ourselves, verify licences and withdrawal terms, and update every review as soon as something changes.
Under the supervision of Editor-in-Chief Mark Rylance
