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Supreme Diamond XXL free demo

Four jackpot tiers sit alongside a hold-and-win collect feature built for big, rare hits.

3 Oaks GamingReleased May 202695.5% RTPHigh volatility5,000× max win

Supreme Diamond XXL slot by 3 Oaks Gaming

Demo mode · fun credits · no real money

Verdict

Supreme Diamond XXL is a high-volatility experience where wins are less frequent but have a higher ceiling.

The 95.5% RTP is slightly below the typical average, and the high volatility means you'll see more quiet spells between the bigger hits. Play it if you enjoy classic gemstone themes with modern bonus mechanics. Skip it if you prefer a smoother, more consistent payout rhythm.

By the DemoSlots editorial team · Updated 14 Oct 2026 · How we test

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Screenshots

The base game uses a 4x5 grid with gemstone symbols and a side panel showing the four jackpot levels.
Triple sevens and X symbols stand out against the colorful gem background.
The bonus button is clearly marked for players looking to trigger features.
A variety of high-contrast gemstone graphics keep the reel set looking sharp.

Gameplay clip

Our own recording of the Supreme Diamond XXL demo, muted.

How it plays

The game uses a 4x5 grid set against a dark blue background, filled with bright, colorful gemstone symbols. You'll see a mix of green triangles, magenta squares, hexagons, and triple sevens, alongside white diamonds that carry specific values. There are 15 paylines in play, meaning symbols need to align in specific patterns to trigger a win. A side panel keeps track of four different jackpot levels, ranging from the Mini to the Grand. The pace is steady, but the high volatility ensures that the excitement is concentrated in the feature rounds rather than the base spins. The layout is clean, with the betting controls and balance clearly displayed at the bottom of the screen.

Bonus features

  • Free Spins
  • Bonus Buy
  • Hold and Win
  • Collect Feature

Who it's for

This one is for players who like the visual style of traditional fruit machines but want the added depth of a hold-and-win mechanic. Because of the high volatility and the 5,000x max win ceiling, it suits those who are comfortable with a few dry spells in exchange for the chance at a significant hit.

Pros

  • Strong set of bonus features including Hold and Win
  • Bright, clear visuals with a polished gemstone theme

Cons

  • High volatility can lead to long stretches of nothing
  • RTP is a touch lower than the industry standard

At a glance

  • Supreme Diamond XXL is a game by 3 Oaks Gaming, released in May 2026, built on 3 reels.
  • The RTP of Supreme Diamond XXL is 95.5%, with high volatility, based on the published payout data.
  • Supreme Diamond XXL can pay up to 5,000× the stake on a single spin.
  • In Supreme Diamond XXL, a free spins round with a bonus buy option is the standout mechanic.

FAQ

What is the maximum win on this slot?

The max win is 5,000x your stake, which provides a substantial ceiling for the high-volatility maths to work with.

How does the bonus buy work?

The bonus buy allows you to bypass the base game and trigger a feature round immediately, though this comes at a cost to your balance.

Themes & features

Diamond

Facts checked 7 Sep 2026 · Sources: our own research and demo testing

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