CROSSFIRE
A 1930s Chicago street at night. Six reels, five rows and forty lines that pay from the left, and cars that roll past while the reels turn. Two of them stop and the box between them turns wild, every winning line through it paid its own price on top.
One Curve. One Decision.
Crossfire is a six reel slot on the same server-authoritative core as the other titles. Forty fixed lines, each reading from reel one, and one stake covers them all. The only wild in the game arrives with the cars: the box bounded by the two that stopped turns wild for that spin, and every winning line whose run passes through it is paid a figure of its own on top of the line. A box no winning line crosses pays nothing, which is the rule the player can check by eye. RTP is 97% and a spin pays at most 3,000× the stake.
Six Reels, Forty Lines
Set the stake and press SPIN. The whole round, the cars and the free spins it may open, is settled on the server before the first reel stops, and the client only plays it back. Each of the forty lines is read from reel one: three, four, five or six of an object in a row pay that object's row on the bill, and every line steps at most one row between neighbouring reels, so a win always reads as an unbroken run.
Two Cars Make A Box
Cars roll over the reels while they turn. One that stops on its own is a near miss worth nothing. Two or more are the corners of a box, and every square inside it turns wild. A box opens on one paid spin in 5.3 and covers 2.7 squares on average. Width is what it is worth: a wild column lets all forty lines through it, so each extra reel multiplies the box by about three and a half.
Every Car Kept To The End
Three newspapers open six free spins and four open twelve. In the feature no box is drawn: every square of the board can catch a car, most often along the middle row, and every car that lands stays wild to the end of the run. A wild already standing inside a new box is doubled. The wall climbs spin by spin, and one whole feature is worth 236× the stake, which is 41% of the game's return.
Six Reels Under The L
The board stands on the street it is named after: the Don on the pavement, the pawnbroker's sign in one corner and the day's paper in the other. Balance on the left, the take in the middle, the stake and SPIN under the board.
One Is A Near Miss
A car rolls over the reels while they turn and stops on a square, headlights on and smoke behind it. One on its own is worth exactly nothing and the sign says which reel is next, so the walk down the remaining reels still has the question in it.
Four Wilds Across, Paid Twice
Two cars are the corners of a box and every square inside turns wild. Here four reels of it carry a line of the Don, doubled by a boss the box caught, and the sign prints exactly that: four in a row on line 3, ×2 a boss in the box, plus the box's own price.
Three Papers Open Six
The bonus card explains itself with the game's own art: a car turns its square wild and keeps it to the end of the run, two cars shoot out a box, a wild already standing inside a new box is doubled, and three more papers add six spins.
Every Car Kept To The End
Free spin three of six. The wilds from the earlier spins are still standing, a line of the Whisky pays through them, and the take in the middle counts up from the server's figure and never from anything the client added.
Wilds Where The Cars Stopped
Five wilds across the board after a wide box, a line of the Dice paying four in a row through them. A box that no winning line crosses pays nothing, which is why the figure on screen is always one the player can trace.
Check The Math Yourself.
Every round is committed before it opens and verifiable after it ends. Operators do not have to take our word for it, and neither do their players.
COMMIT
Before a round opens, the server publishes sha256(server_seed). That hash pins the crash point in place before the first bet is taken.
PLAY
The round runs. crash_at derives from HMAC-SHA256(server_seed, client_seed:nonce), so neither side can steer the outcome mid-round.
REVEAL
After the bust, the server reveals server_seed. Anyone can rehash it, recompute crash_at, and confirm both match the record.
THE REFERENCE VERIFIER AND FULL DERIVATION SHIP WITH THE INTEGRATION DOCS.
$ rara verify --game crossfire --round 001042 # hash published before bets opened server_seed_hash sha256:9f2c71a84be…c30be81a client_seed crossfire-demo-7f3a nonce 001042 hmac = HMAC_SHA256(server_seed, client_seed + ":" + nonce) = 7c2e4d09aa61b8e2…10f4b90f h = int(hmac[0:8], 16) crash_at = max(1.00, floor(99 * 2^32 / (h + 1)) / 100) = 3.47x $ rara reveal --game crossfire --round 001042 server_seed 4b7dd21c09aae5…f133c2e9 sha256(server_seed) == server_seed_hash ok recompute(crash_at) == 3.47x ok verify == true
The Math Ships With The Game.
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.
Put CROSSFIRE On Your Platform.
Integration docs, the full math spec, and playable builds are available under NDA to operators, aggregators, and platforms.