Rainbet Originals: the in-house games, and the one idea behind them

The Originals are Rainbet’s own games rather than slots licensed from a studio, and they share a look: stripped back, no reels, no paylines, just the bet and the result. What they share that matters more is provable fairness — the one consumer protection on this site that works without any regulator behind it, which is exactly why it deserves more than a marketing line for a player in Ireland.

The set runs to Plinko, Mines, Dice, Limbo, Crash, Wheel, Keno, HiLo, Tower and Chicken Cross, with in-house versions of Blackjack, War and Rock Paper Scissors alongside.

Provably fair, explained properly

Most explanations are either two lines of marketing or a cryptography lecture. Here is the useful middle.

The problem is simple: when you play online, how do you know the result was not chosen after you bet, in the house’s favour? Normally you cannot. You trust that a test lab audited the random number generator, and that a regulator made the operator pay for the audit.

Provable fairness replaces that trust with arithmetic. Three inputs decide each round:

1. The server seed — a random string Rainbet generates. Before you play, you are shown its cryptographic hash, a fingerprint from which the seed cannot be worked out. That is Rainbet’s commitment: the seed is fixed before your bet, without being revealed.
2. The client seed — a string you control and can change whenever you like. Because you supply an input, the house cannot know the combined result in advance.
3. The nonce — a counter that goes up each round, so the same seeds still give different results.

After the round, the server seed is revealed, and you can check two things. Hash it yourself and confirm it matches the fingerprint you saw beforehand: the seed was not swapped. Then run all three inputs through the published algorithm and confirm they give the result you got.

If anything had been altered, the hash would not match. It is not a promise; it is a calculation, and you can run it.

What it does not do

Precision matters here, because provable fairness is routinely oversold.

It does not remove the house edge. Every Original has one. Verification proves the round was honest, not that the bet was fair value. A provably fair game at 97% RTP still keeps three cents in every dollar over time.

It does not get you paid. Checking that a round was fair is a different thing from an operator processing your withdrawal, honouring a bonus term or keeping your account open. Those are conduct and licensing questions, and no cryptography touches them.

It does not need you to use it. Almost nobody checks every round. The value is that anyone can, which makes tampering detectable and so not worth trying.

For an Irish player this carries more weight than usual. A GRAI licensee answers to a regulator with investigation and sanction powers under the Gambling Regulation Act 2024. Rainbet does not. Provable fairness is the one assurance on the site that works with no regulator at all.

The games, in three families

Pure-odds games show you the probability and the payout up front.

• Dice is the best place to start: choose a target and over or under, and the screen shows the exact win chance and multiplier. The gap between the two is the house edge made visible. Understand Dice and every other Original becomes legible.
• Limbo turns it round: pick a target multiplier, and you win if the random one lands above it.
• Wheel spins a segmented wheel; the risk setting changes how the segments pay, not the long-run return.
• Keno has you pick numbers and pays on matches — a lottery draw on demand.
• Plinko drops a ball through pegs into multiplier slots; higher risk widens the gap between the centre and the edges. It runs fast and automates easily, which is exactly why it needs a session budget.

Climb-and-cash-out games build a multiplier step by step until you stop or lose.

• Crash starts a multiplier at 1.00x and lets it climb until it stops without warning; you cash out before it does. It is the whole stopping problem in one screen.
• Mines hides mines among gems on a grid; each safe pick raises the multiplier and one mine ends the round. You choose how many mines, which sets the risk.
• Tower is a climb: pick the safe tile on each level and cash out whenever you like.
• Chicken Cross, a game Irish players search for by name, sends a chicken across lanes of traffic; every safe crossing adds to the multiplier, and the risk setting decides how heavy the traffic is.
• HiLo deals a card and you call higher or lower, building a multiplier chain.

Card games bring classics in-house: Blackjack, War (draw the higher card) and Rock Paper Scissors against the house.

The shape that matters: stopping

Five of these games share a structure worth naming, because it changes how you should play them.

Crash, Mines, Tower, Chicken Cross and HiLo are incremental-risk games: the multiplier grows a step at a time, stopping is always possible, and stopping always feels premature. It is genuinely good game design, and it is also how a session becomes longer than you meant.

The countermeasure is dull and effective: decide your cash-out point before the round starts, and use auto-cashout where it is offered. A rule set in advance beats judgement under pressure, because the pressure is the design.

The second trait is speed. No reels, no animation, no bonus round: a round can take three seconds. A $1 bet every three seconds is $1,200 an hour of exposure. Size the stake against the pace, not against how small each round feels.

Risk settings and RTP

Most Originals let you choose a risk level, and it is widely misunderstood. Raising the risk widens the spread — bigger possible wins, more frequent losses. It does not usually change the RTP. What it changes is variance, and therefore how long a bankroll lasts.

Returns across the set typically sit between 96 and 99 per cent, better than most slots. The figure for each game is in its information panel, and that panel — not any general claim, including ours — is the number to trust.

Demo mode

The Originals offer a demo with virtual credit. It is the right way to feel the pace and see what a risk setting does to the results before real money is involved. As always, a short demo run says nothing about long-run value; use it for mechanics only.

Where they fit

The Originals are the most interesting part of Rainbet and the easiest to overplay: better returns than most slots, verifiable fairness and complete transparency about the odds, set against a pace and a stop-when-you-choose structure built to keep you in the chair.

Play them with a preset stop and a stake sized for the speed, and they are the best value on the site. Play them without either, and the speed does in an evening what the house edge would otherwise take a month to do. The casino page covers the third-party lobby, and the VIP page explains how rakeback applies to Originals play.

Try the Rainbet Originals

18+ only. Only gamble with money you can afford to lose. Gambling Care is free on 1800 936 725, 24 hours a day. See responsible gambling.

Last updated: 21 October 2026