Bubble Up! Slot Review – Demo, RTP & Features

Bubble Up! is a high-volatility underwater slot from Pragmatic Play that combines a large reel grid with Money symbols, randomly appearing Frames and a progression-based Free Spins feature.

The game uses 6 reels, 6 rows and 40 pay-lines, while its strongest moments come from catching valuable Money symbols inside Frames rather than relying only on ordinary line wins.

The theme is light-hearted and colourful, with fish, shells, seahorses and other sea creatures filling the reels against a bright cartoon-style ocean backdrop. A smiling octopus and coral-covered surroundings keep the presentation playful, while the bonus mechanics add most of the tension.

The main attraction is the Frame Feature. A frame can randomly appear in the base game and collect the values of Money symbols inside it. A second frame may also land, and if the two overlap, Money symbols inside the shared area can receive multipliers of up to x10.

Free Spins strengthen this mechanic considerably. At least one Frame appears on every spin, Scatter collection can expand the frame from 2×2 all the way to 6×6, and pre-feature modifiers can add more Money symbols, more Scatters or guaranteed dual Frames.

Bubble Up! has a highest RTP of 96.52%, a hit frequency of 15.08%, and a maximum win of 10,000x the bet. Bets start from €0.20, while the maximum standard stake is €240 and can rise to 360 with the Ante Bet.

Game Features

Bubble Up! is played on a 6-reel, 6-row grid with 40 pay-lines. Winning combinations are formed by landing at least three matching symbols across an active payline, beginning from the leftmost reel.

Lower-paying symbols include starfish, shells, snails and shrimp, while higher-value symbols feature seahorses and several colourful fish. There are no Wild symbols in the game, so most ordinary wins are created entirely from matching regular symbols.

Money Symbols

Money symbols are given random cash values on each spin. These values can range from 0.5x the bet up to the 10,000x Maxi prize.

Money symbols can pay in two different ways:

• As part of a regular winning combination.
• By landing inside an active Frame.

Several fixed prize values are also available:

• Mini – 20x
• Minor – 40x
• Major – 80x
• Grand – 200x
• Maxi – 10,000x

The Maxi matches the game’s overall maximum win.

Frame Feature

The Frame Feature can activate randomly during the base game. A frame measuring anywhere from 2×2 to 6×6 appears somewhere on the grid. At the end of the spin, all Money symbols positioned inside the frame have their values added together and paid.

A second frame can also appear on the same spin. If the two Frames overlap, Money symbols sitting in the shared area receive an additional random multiplier of: x2, x3, x5, x8 or x10. The multiplier increases the value displayed on the affected Money symbol before the final collection takes place.

Dual Frames

When two Frames appear together, each can independently collect eligible Money symbols.

The most valuable positions are those located inside the overlapping area because they gain the additional multiplier before being included in the total. This makes dual-frame situations one of the strongest base-game setups in Bubble Up!.

Free Spins

Landing 3, 4, 5 or 6 Scatter symbols triggers the Free Spins feature.

Players always receive 6 initial Free Spins, but the number of starting modifiers depends on how many Scatters triggered the bonus:

• 3 Scatters – 1 modifier
• 4 Scatters – 2 modifiers
• 5 Scatters – 3 modifiers
• 6 Scatters – 4 modifiers

Before the feature begins, eight coins appear on screen. Players reveal them until matching pairs of modifier names are found. Each matching pair activates one modifier for the coming bonus.

Free Spins Modifiers

Four different modifiers can become active.

More Money Symbols

Increases the number of Money symbols available on the reels.

More Scatter Symbols

Adds additional Scatters to the reel strips, improving the chance of progressing the frame.

Level Up

Starts Free Spins with the Frame already expanded to 3×3 rather than 2×2.

Dual

Guarantees two Frames on every Free Spin. The Dual modifier is particularly valuable because overlapping Frames can multiply Money symbols throughout the feature.

Expanding Frame Progression

At least one Frame is guaranteed on every Free Spin. Scatter symbols collected during the feature are added to a progression trail above the reels.

For every 3 Scatters collected, two things happen:

• The Frame grows by one size.
• 2 additional Free Spins are awarded.

The progression moves through:

2×2 → 3×3 → 4×4 → 5×5 → 6×6

Upgrades become active from the following spin. If enough Scatters land together to complete more than one progression step, all corresponding upgrades and extra spins are awarded at once.

Ante Bet

Activating the Ante Bet increases the normal stake by 50%. In exchange, Free Spins begin with more modifiers than under normal play.

With the Ante Bet active, landing 3, 4, 5 or 6 Scatters provides 2, 3, 4 or 5 modifiers, respectively. This improves the chance of starting Free Spins with several useful enhancements already active.

Super Spin 1

Super Spin 1 costs 20x the normal bet.

Every spin is guaranteed to contain one Frame of random size. This creates immediate Money-symbol collection potential without needing the Frame Feature to activate randomly.

Free Spins cannot trigger from this mode.

Super Spin 2

Super Spin 2 costs 100x the bet. Two Frames are guaranteed on every spin, creating opportunities for overlapping positions and Money-symbol multipliers. As with Super Spin 1, Free Spins cannot trigger while using this mode.

Feature Buy

Where permitted, the Free Spins feature can be purchased directly for 100x the bet. The purchased feature begins with the standard Scatter-triggered Free Spins setup.

Availability depends on the casino and jurisdiction.

RTP and Volatility

Bubble Up! has a highest RTP of 96.52%. Lower configurations of 95.55% and 94.51% may also be available.

The game uses high volatility, while its hit frequency is listed at 15.08%. Free Spins trigger at an average frequency of approximately 1 in 169.63 spins. The maximum win has a stated probability of around 1 in 4,342,087 spins.

10,000x Maximum Win

The largest possible payout is 10,000x the bet. This amount can be reached through the Maxi Money symbol, meaning the maximum does not necessarily require a long combination of cascades or multipliers.

If the total win reaches the 10,000x cap during Free Spins, the feature ends immediately and the maximum amount is awarded.