A masked puppeteer draws gold silk across a miniature theatre. Needles connect, their path turns Wild, and wax seals make each crossing worth more. When the curtains rise on The Final Act, the marks remain.

The Stringmaster is a 5×4 slot with fourteen fixed paylines and one board per spin. Connected Needles turn crossed cells Wild and leave seals that double up to 128×. The ordinary paid game targets 96.40% RTP, with a 4,500× cap across the whole round, including The Final Act.
Three or more matching symbols pay from the first reel. Each line pays its best combination. The completed board stays on stage until the next spin: no tumbles or refills. Ordinary wins do not create seals.
Two to four Needles connect in one chain: leftmost, rightmost, next leftmost, next rightmost. Each crossed cell becomes Wild and gains a 2× seal, or doubles its existing seal up to 128×. A line uses the sum of the seals on its matching cells.
Three, four or five Curtains award 8, 10 or 12 free spins. The Act begins with clean seals, then keeps its new seals between spins. The last Needle carries forward, and the first and last free spins guarantee a pair. Curtains can retrigger the Act.
Share of 500,000 ordinary paid rounds reaching each multiplier, including naturally triggered Final Acts. Sampled from law 0.1.0; the bars show a sample, not a certified distribution.

Five reels of four rows behind the gold frame, the masked puppeteer at the side of the stage. The Sun King, Moon Queen, Count and Harlequin lead the paying cast; SPIN states its cost and BUY FEATURE sits beside the stake.

Four Needles connect leftmost to rightmost in one chain. Every cell the thread crosses turns into a porcelain Wild and takes a 2× seal, and the seal doubles to 4× where a second segment crosses the first.

The board pays line by line: this one is worth 18.00 CR, and the take stands at 129.60 through line ten of thirteen. A line pays its paytable figure times the sum of the seals on its matching cells, 2× through 128×.

Three, four or five Curtains open eight, ten or twelve free spins, and the card waits for the press. The Act opens on a clean board: the triggering spin's seals stay on the board that made them.

Three free spins left of the run. The theatre has changed and the board holds its seals at 2× beside a 4× on a Curtain, while the Act's running total stands at 42.10 CR. Curtains inside it retrigger the same award.

The Act closes on its own total, 64.90 credits on a 1.00 stake. The four cards are BIG WIN at ×15, MEGA WIN at ×30, EPIC WIN at ×60 and EXPLOSIVE WIN at ×1,000, all under the 4,500× whole-round cap.
The current build runs on demo credits with a deterministic local engine. Its seed, board, threads, seals and credited award can be replayed under the same law. The source includes a math spec and simulation results; this prototype is not an independently certified outcome service.
Each draw has its own seeded outcome stream. The presentation reads the result; its animation never changes the award.
Connected Needles keep their identity and also pay as Wilds. A crossed Curtain can pay as Wild while still counting toward the feature.
The source audit measures 96.4090% for the paid game against a 96.40% target. The bought Act and Threadchain spin target 98.00% of their own prices.
Documented rules and reproducible simulation results.
THE STRINGMASTER / THREADCHAIN law stringmaster-0.1.0 grid 5 × 4 fixed paylines 14 seal ladder 2 → 4 → 8 → 16 → 32 → 64 → 128 whole-round cap 4,500× paid RTP target 96.40% source audit 96.4090% Threadchain 28× stake More Curtains 2.75× stake Final Act buy 100× stake buy / press RTP 98.00% target
RaRa Studio is an independent game studio in Tbilisi, Georgia. Every title starts as a model: simulated, stress-tested, and documented before the art goes in. Spec sheets and verifiers are part of the product, and Vice Run is the first title through the pipeline.
Integration docs, the full math spec, and playable builds are available under NDA to operators, aggregators, and platforms.