Thunder Coins XXL: BoosterCells

Overview

Thunder Coins XXL: BoosterCells takes everything players love about the original Thunder Coins to the next level. Set on a classic 3×5 grid with 15 paylines, this exciting sequel combines nostalgic fruit symbols with lightning-charged Coins, striking neon effects and a powerful new way to accumulate winnings. During the Bonus Game, the BoosterCells Feature keeps the accumulated Coin values on the reels, allowing them to grow throughout the entire session. Each Thunder Coin can boost them even further at random, turning small wins into huge prize opportunities.

Players can access the Bonus Game instantly with the Buy Bonus Feature or increase their bet with two Extra Bets that double or triple the chance of triggering the Bonus Game, while the Thunder Spin Extra Bet guarantees a Thunder Coin on every spin. With constantly increasing Coin values, exciting Jackpot prizes and lightning-driven gameplay, Thunder Coins XXL: BoosterCells delivers a classic slot experience full of adrenaline and with great winning potential.

Main Game

Players can select the bet amount before starting the game round. Clicking the «Play» button starts the game round.

General Information

Game features

• Thunder Feature
• Extra Bet
• Bonus Game With BoosterCells Feature
• Thunder Coin
• Gold Stack Feature
• Coin
• Jackpots
• Wild
• Buy Bonus Game

Prize information

Limitations

Game screen

The game screen has a size of 1280х720 pixels and is made up of two main elements: the game panel and the video display area.

Video display area

The reels are shown in this area.

When opening the «Bet Menu», the «Autoplay Settings» or the «Game Menu», the video display area is completely replaced.

When clicking the «X» button, the player can return to the reels screen.

Game panel

The game panel is located at the bottom of the reels in the mobile [vertical] version. In the desktop and mobile [horizontal] version, the game panel is located at the bottom and to the right of the reels. It shows the amount of credits available in the player's account, as well as the winnings and bet information.

The game panel also includes game controls, where the player can perform these actions:

• Change the bet by pressing or clicking the «Bet Menu» button to open the bet menu and choose the preferred bet.
• Increase the bet by 1 step by pressing or clicking the «Plus» button.
• Decrease the bet by 1 step by pressing or clicking the «Minus» button.
• Spin the reels by pressing or clicking the «Play» button.
• Start a series of spins in the fastest available speed mode by holding down the «Play» button. The series of spins stops immediately when the player releases the «Play» button.
• Configure the advanced Autoplay settings by pressing or clicking the «Autoplay» button. It can be enabled/disabled depending on local laws.
• Check the game information and the prize table by pressing or clicking the «Information» button.
• Change the game settings by pressing or clicking the «Game Menu» button.
• Turn the audio on and off by pressing or clicking the «Audio» button.
• Adjust the game speed by pressing or clicking the «Speed Mode» button. Normal speed mode. By pressing or clicking the button once while in Normal mode, the speed mode changes to Fast.
• Fast mode is faster than Normal. By pressing or clicking the button once while in Fast mode, the speed mode changes to Turbo.
• Turbo mode is the fastest speed setting. By pressing or clicking the button once while in Turbo mode, the speed mode changes to Normal. It can be enabled/disabled depending on local laws.

Game features

THUNDER FEATURE

• The appearance of a Thunder Coin in combination with any Coin triggers the Thunder Feature.
• The Thunder Feature gathers the values of all Coins, including Jackpot Coins, and adds them to the current spin win in the Main Game or the Total Win in the Bonus Game.
• When a Thunder Coin appears in the Main Game and there are no Coins present, Coins could be added randomly to the reels to trigger the Thunder Feature or the Bonus Game.
• When one or more Coins fall in the Main Game and there are no Thunder Coins present, a Thunder Coin could be added randomly to the reels to trigger the Thunder Feature or the Bonus Game.

BONUS GAME WITH BOOSTERCELLS FEATURE

• If Coins fall on reels 1 and 3, together with a Thunder Coin on reel 2, the Bonus Game is triggered.
• During the Bonus Game, only Coins and Thunder Coins fall on the reels.
• Thunder Coins only fall on reel 2 and stay fixed for the duration of the feature.
• Each Coin shows the value of 1x, 2x, 3x, 4x, 5x, 6x or 8x the total bet.
• The Bonus Game starts with 3 new spins.
• Each new symbol resets the number of new spins to 3.
• Each Coin collected in the Bonus Game leaves its value stored in the cell where it has fallen.
• If another Coin falls in a cell that already contains a stored value, that value is added to the Coin's value.
• The total value of the Coin therefore becomes the new stored value for that cell.
• Each time a Thunder Coin appears, it can randomly increase several stored values on the reels.
• When the player runs out of new spins, the Bonus Game ends and the values of all Thunder Coins are added to the Total Win.

GOLD STACK FEATURE

Any Coin that falls on the reels during the Main Game could trigger the Gold Stack Feature, which adds enough Coins or Thunder Coins to trigger the Bonus Game.

JACKPOTS

The random appearance of the following Coins during the Thunder Feature triggers the corresponding Jackpot:

BUY BONUS GAME

The player can buy:

• The Bonus Game for 75x the total bet.
• The Super Buy Bonus Game, with 3 guaranteed Thunder Coins for 200x the total bet.

The Buy Bonus Game feature is not available when the Extra Bet is active.

This feature can be enabled or disabled according to requirements. The RTP of each type of purchased Bonus Game is shown in the following table.

EXTRA BET

The player can activate:

• Double Chance, which doubles the chance of triggering the Bonus Game for 1.5x the total bet.
• Thunder Spin, which triples the chance of triggering the Bonus Game and guarantees a Thunder Coin on every spin for 4x the total bet.

This feature can be enabled or disabled according to requirements.

PAYLINES

Paylines award winnings for consecutive symbols from left to right. Only the highest win per payline is paid.

The active lines are fixed: 15 lines.

The payout information in the Payout Table is already shown with the exact money value according to the player's bet.

The maximum reward is limited to 12,000 times the total bet. If the total win in a round reaches the limit, the round ends and the prize is paid immediately.

Randomization

Random Number Generator (RNG)

The algorithm used for the pseudorandom generation of numbers (PRNG) is a deterministic random bit generator (DRBG). The cryptographically secure implementation (CSPRNG) of the OpenSSL library version 1.1.1f (released on 31 March 2020) is used. In addition, background cycles and periodic reseeding are used.

OpenSSL comes with a default implementation of the RAND API based on the DRBG model as described in NIST SP 800-90A Rev. 1. The Open Source Technology Improvement Fund evaluates the OpenSSL library, and its security evaluation can be found in the published documentation.

Error handling

If a player tries to access a game through an invalid session (for example, due to inactivity or a system restart), an error message is shown in the game. The player can log in again and resume the game. The game state is always saved so that the player can resume the game exactly at the moment they left it.

In the case of an HTTP error, a network timeout error or a server error, the player will be shown a «technical error» message.

Player information

Players have access to the game rules at all times.

Game simulation

A demo version of the game is available.

Last modification date: 10/23/2026