Thunder Cash is a 2017 Ainsworth Game Technology release built around a Hold and Respin mechanic that would go on to become one of the most widely imitated feature formats in the industry. Ainsworth arrived at this mechanic with characteristic land-based practicality — the system is simple to understand, visually legible, and delivers clear escalating tension as each coin symbol locks in place. The game’s high-voltage theme and stormy visual design give it an energy that suits the feature’s build-up well.

The base game runs on a 5×3 layout with 25 paylines and bets from $0.01 to $100. High volatility is the natural consequence of a math model that concentrates prize delivery into the respin feature rather than distributing it across regular spinning. Base game wins are secondary; the coin symbols that trigger the bonus are the primary event every session is building toward.

The Hold and Respin mechanic triggers when enough coin symbols land simultaneously. Coins lock in position on the grid and three respins are awarded. Any new coin landing during the respins also locks in place and resets the counter to three, giving the feature an open-ended quality: a board that starts with a modest coin cluster can grow into something significantly larger if new coins keep arriving. The endpoint of a perfect run is filling the entire board, which awards the Grand Jackpot — the game’s top prize. A progressive jackpot linked version of Thunder Cash is available in land-based venues, with no fixed maximum win ceiling.

RTP is 94.98% and volatility is high.

Thunder Cash is an important game in the Hold and Respin genre’s history and remains a compelling play in its own right. The mechanic’s building tension is genuinely effective, and the Grand Jackpot target gives every respin feature a clear and exciting objective.