Thunder Coins: Hold and Win - the Rules, Restated

Quick spec

Board, lines, stakes

Three reels, three rows, five fixed lines. Lines pay left to right and only the highest win per line counts. Stakes run from 0.20 to 100.00 in nineteen steps. Autoplay and hold-for-turbo sit on the main screen, one control each. Malfunction voids all pays and plays, the standard clause from the last info screen.

Paytable in stake multipliers

Values match the build's own paytable at a 1.00 stake, where cash equals multiplier. At any other stake the screen shows cash and the ratio holds. The Wild substitutes every symbol except Bonus and Thunder Bonus, and it doubles as the top line pay. Cherries at 1x are the floor. The gap between 50x and 1x is the whole line-game economy. The lines keep the meter moving and the bonus engine does the paying.

Trigger geometry

The Bonus coin lands on reels 1 and 3 only. The Thunder Bonus - the lightning in the gold ring - lands on reel 2 only. One coin per outer reel plus anything in the middle column is the shape every trigger takes. That split matters when you read a near miss: two coins on the outer reels mean the middle already decided.

Any Bonus coin landing in the main game can also trip the Pile of Gold feature. It throws extra Bonus and Thunder Bonus symbols onto the board, enough to activate the Bonus Game or more. The rules do not price its odds. Unverified stays unverified.

The Bonus Game, step by step

The round starts once every reel carries at least one Bonus symbol on the same spin. The board clears, and from there only coin symbols land. Each coin prints its value on its face - x1, x2, x3, x5, x7, x10 or x15 the stake. Three re-spins open the round on the cleared board. Every incoming coin puts the counter back at three, and the round ends when it runs dry. All printed values then pay as one total.

Four jackpot coins can drop during the round - Mini at 25x, Minor at 50x, Major at 150x, Grand at 1,000x. They land as board symbols, not as a side wheel, and their printed tier pays with the rest. The longest round in our own session ran 24 re-spins, and the pool's median round paid 48x. The engine runs on small resets. Length buys chances, not guarantees.

The Thunder Bonus, as sold and as logged

The lightning is a collector. When it lands together with any Bonus symbol in view, it sweeps the printed value of every coin on the board - jackpot coins included - and adds the sum to the spin win, or to the running total inside the Bonus Game. The intro screen sells this as the game's headline. Our pooled log answers with a plainer line. In 48 recorded bonus rounds across three sessions the lightning never landed once. The rules promise no frequency. Neither do we. Both facts belong on the same page, which is why this page exists.

The number this build does not print

There is no RTP line anywhere in the 37 info screens. The one figure in circulation, 95.66%, comes from aggregator sheets rather than from the game. I log what the build pays and publish that instead: 100.84% across 6,343 pooled spins, session detail in the review. Two numbers, two different things measured. Treat the first as a claim and the second as a sample.

Verified against

Session TCHW-20260729-01 - 2,960 spins of the 6,343-spin pool, July 2026, checkpoint discipline throughout. All 37 info screens sit in the session archive. The session tables, screenshots and the score live in the Thunder Coins: Hold and Win review. The launch build is on the demo shelf, and the protocol is on the methodology page. The Hold and Win family itself is charted on a separate page, five carriers side by side. What this page did not verify - feature frequencies and the lightning itself. Both go on the list for the next build. 18+ applies to every mode of this game.