Mobile slots: how we test every game before it ends up in the guide
Most spins in Sweden are taken on a phone, but surprisingly many games are still built for a wide screen and then shrunk down. The difference is noticeable immediately: buttons that are in the wrong place, text that's unreadable and bonus modes where half the information ends up off the edge.
That's why we run every title on mobile before it gets a place in the catalogue. Here is the seven points we go through — and the errors we most often see.
Why the mobile is the main screen
A slot is rarely played in one long session in front of the computer. It's played for ten minutes on the sofa, in line, on the commuter train. That means the game must start quickly, withstand an interruption and be playable with a thumb — preferably without accidentally hitting max bet when the train brakes.
The providers know that, but the result varies greatly. Some studios build the interface for the phone first and scale up. Others build for a 27-inch screen and let the mobile version become a shrunken copy where nothing has been moved to where the thumb actually reaches.
Checklist: seven points
- Start time. How long does it take from click to the first spin-ready screen? A game that takes half a minute to load on a normal connection gets marked down.
- Hit areas. Can spin, bet and autospin be hit with your thumb without aiming? Is «increase bet» uncomfortably close to the spin button?
- Readability. Can you read balance, bet and win amount without squinting? Symbols that become blurry when scaled down are a fail in themselves.
- The info panel. Can the rules, RTP and payout table be opened and scrolled on the phone? The panel is where we get the numbers — if you can't access it the page gets worse.
- The bonus mode. Does the bonus fit on the screen, or do counters and multipliers end up off the edge when something actually happens?
- The interruption. What happens if you switch apps mid-round, or lose signal in a tunnel? A mature game resumes where you left off.
- Sound and vibration. Can they be turned off separately, and does the game remember the choice for the next session?
The errors we see most often
The most common is the info panel that can't be scrolled. The payout table is there, but it gets stuck halfway or reads the swipe as an attempt to close the window. The next most common is autospin hidden behind a long press without anything to suggest it.
Then comes the classic: buttons placed too close together. On a desktop with a mouse pointer, four pixels of spacing is no problem. With a thumb in motion it's the difference between one krona and twenty per spin. We note it every time, because it's the kind of design that costs money without the player noticing why.
And then there are games that are perfectly fine — but that forget to save the sound setting. Small fault, but it says something about how much care has been put into the screen where people actually play.
Portrait or landscape mode
Most modern slots handle both, but they're rarely equally good at both. Portrait mode shows more rows and a more comfortable thumb position; landscape gives larger symbols and more room for bonus animations. Our rule of thumb: a game must be fully playable in portrait mode, for that's how the phone is held when you're just going to take a few spins.
A sign of carelessness is when the game forces landscape mode with a «turn your phone» sign and then offers no way back. Another is when portrait mode works in the base game but not in the bonus — you only notice when something finally happens, which is the worst possible moment.
Load time, data and battery
We don't measure battery consumption in percent — it depends on too many things outside the game to be a fair number. Instead we note when a game is noticeably heavy: when the phone gets warm after a few minutes, when animations stutter on a normal device, or when the initial load consumes an unusually large amount of data.
Here the differences are large between studios. Simpler classic titles start almost instantly, while heavy productions with full-screen animations can take several seconds each time. Neither is wrong in itself, but it's worth knowing before you open a game on a weak connection.
What an approved mobile game means to us
The mobile test does not give its own rating for the slots page. It affects the overall rating, and clear problems are written out in plain language in the review — «the info panel isn't scrollable on mobile» is a sentence that belongs in a review, not in a footnote.
If you prefer to go straight to the numbers you'll find them in the catalog, and what they mean is explained in our guide on RTP, volatility and max win. Our entire methodology is open on How we test.
Frequently asked questions
About mobile gaming and our tests
Is RTP lower on mobile?
Do I need an app to play slots on mobile?
What happens if the connection is interrupted mid-round?
About the writer
Who tested it
Writes the blog's guides and test notes on INFERNOSLOTS. Prefers to play on mobile in the evening — which is exactly why the mobile test became her pet project. All by Elin →
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