Developer Thunder Ball by Ela Games is a fruit-style casino slot built around collecting bonus values and triggering feature rounds. In the main game, a special Collect symbol gathers bonus symbols with values from 1x to 15x. When both appear together, the Boost feature awards the collected values and jackpots in one sequence. The slot also includes Lucky respins, which can deliver wins or open entry to the bonus game.
The Thunderball feature adds early multipliers before the bonus round begins. Inside the bonus game, players receive 3 resetting respins, with Grand, Major, Minor, and Mini jackpots available. Multipliers can increase by +2 on the same cells, lifting the value before collection. This structure gives Thunder Ball a ruleset centred on repeated respins, symbol collection, and jackpot outcomes.
A demo version is available to play for free, which allows players to review the mechanics and practice before playing for real money. The free demo also shows how the bonus symbols, multipliers, and jackpot features work during regular spins and feature rounds.
