Games

Sleep Tight

Two factories in the clouds fight over your sleep. Every Z on reels 1, 3 and 5 becomes a wheel that pours into the Dream Pipe, and two tubes fill until one side wins the night.

Play the demo The one-page sheet

RTP: 96.29%
Volatility: 9.31
Max win: 10,000×
Rungs: 1

Press to load the full game in this frame. It waits for the press because the game engine is about two megabytes.

The story

One night, two factories

A secret laboratory in the clouds where dreams are made. Professor Nimbus bottles sweet dreams, Mister Midnight brews nightmares, and both of them want you tonight. Spin dreams and Nimbus wins the night; spin nightmares and Midnight does.

Act I · The night shift
You're asleep, and neither side has you yet.
High in the clouds, two factories are working on your night. Cloud 9 bottles sweet dreams on the left and the Midnight Works brews nightmares on the right. Every winning line sends a wisp into its own side's tube: pink for a dream, green smoke for a nightmare.
Act II · Sweet Dreams
Nimbus won the night.
Cloud 9 runs at full steam while you count ten sheep. Only Dream Wheels land, and often. Nimbus cheers on the left, and Midnight has shrunk behind his own tube, shielding his face from the light.
Act III · The Nightmare
Midnight won the night.
Count ten sheep, and don't look under the bed. A Nightmare Wheel lands on every spin while Midnight towers over the right side with his arms spread, and Nimbus crouches behind his tube and peeks out. When the last sheep is counted, the alarm rings.

The cast

One dream maker, one nightmare brewer

Professor Nimbus

Cloud 9, the dream factory

Made of his own weather: his hair and beard are the factory's dream clouds. He bottles every sweet dream you spin, and the pink tube is his stock.

The night shifthopes
Sweet Dreamscheers
The Nightmarehides

Mister Midnight

The Midnight Works

His coat pours nightmare smoke, and the clock that strikes twelve on the reels is his own. He brews every nightmare you spin into the green tube, and he wants the sleepers for himself.

The night shiftschemes
Sweet Dreamsshivers
The Nightmaretowers

Where it can go

Read from the market packs the server applies, so it never lists a game as launchable where a launch would be refused.

The game, dimensioned

The grid the engine addresses, at its real proportions, with the title block of the pack it was drawn from. The cells, the lines and the signature are all read from the game; none of it is typed.

Drawn from Sleep Tight’s own view and its rtp9627 pack. The grid, the lines and every figure in the title block come from those two sources.

The figures

Read out of this game's measured evidence pack, which the measurement run writes itself.

RTP: 96.29% ± 0.042
Volatility: 9.31
Max win: 10,000×
Hit frequency: 17.17% ± 0.0048
Max win probability: 1 in 24.1m
Feature frequency: 1 in 199
Layout: 5×4, 14 fixed lines, prize wheels
Bet range: €0.10 – €100.00
Bought modes: 2
Evidence dated: 27 Oct 2026
Rounds behind the witness: 940,722,740

What one round can cost you

Maximum exposure, one round10,000× the stake, at the top of the default ladder (€100): €1,000,000
Capped at €5 a spina Tier-1 licence override: one row in the database, not a new build: €50,000
Expected margin, base game1 − RTP, ± 0.04 pp at 95% confidence: 3.71%

The RTP ladder

Operators in different markets are served different rungs, so we publish the whole ladder. Each rung is measured on its own evidence; none is inferred from the rung above.

Profile	Return	Method	Pack
rtp9627lead	96.29% ± 0.042	batch-means	Complete

Every wager, and what it returns

Each mode is measured on its own. A bought round and a base spin are different products at different prices, and they do not return the same.

Mode	Cost	Return	Method	Hit rate	Max win
Base	1×	96.29% ± 0.042	batch-means	17.17%	1 in 24.1m
Order a Sweet Dream	100×	96.27%	batch-means	100.00%	n/a
Order a Nightmare	100×	96.27%	batch-means	99.99%	1 in 149k

How it plays

What is on the board and what each symbol does. These are the same rules the game shows a player.

Five reels, four rows, fourteen lines

A line pays from reel 1, left to right, for three, four or five of a kind. The fourteen lines are fixed and every stake covers all of them. The same cell can pay on several lines at once.

Nothing stands in for anything. There is no wild and no scatter, so a line is exactly what it shows.

Reels 1, 3 and 5 can also land a Z, one at most on each. A Z joins no line: it turns into a wheel.

The fourteen lines, as the game reads them

The dreams, from the pillow to the end of the sky

Feather
Bubble
Rainbow
Star
Comet

The nightmares, by the hour they strike

Chattersstrikes at 8
The Closetstrikes at 9
Websterstrikes at 10
Lumpstrikes at 11
Midnightstrikes at 12

The nightmares are the high symbols: the least of them pays at least what a comet pays for the same run, and within a side a later rung never pays less than an earlier one.

And the two that turn into wheels

Dream ZLands on reels 1, 3 and 5 only, one a reel at most, and becomes a Dream Wheel.
Nightmare ZThe same reels and the same rule, and it becomes a Nightmare Wheel.

The wheels

Every Z is a wheel, and every wheel pours into the pipe

A Z becomes a wheel of seven slices over its own cell. When the reels have stopped, the wheels turn from left to right and pour into the Dream Pipe under the board, which starts at the spin's line win. A plus adds that many bets to the pipe; a times multiplies everything in it so far.

**Dream Wheel**+10×3+50×3+10Z+5In the night shift and all through Sweet Dreams.

**Nightmare Wheel**+25×5+100×10+50Z+10In the night shift, and on every spin of the Nightmare.

The order is part of the sum

A ×3 on reel 1 and then a +50 on reel 3 make (line win × 3) + 50. The other way round, the same two slices make (line win + 50) × 3. A times on an empty pipe multiplies nothing.

A Z slice is a push. In the night shift it pours 3 into the tube of its own wheel's side. Inside a night it sends one more sheep.

The slices are drawn the same size and are not equally likely. The game's rules page states the chance of every one.

The tubes

A race between two tubes

Every winning line feeds the tube of its symbol's side: 1 for three of a kind, 2 for four, 3 for five. A Z slice adds 3 to its own side. Fill a tube and that side wins the night.

Nimbus bottles every dream you spin. Each winning line of feathers, bubbles, rainbows, stars or comets pours in, pink.

Midnight brews every nightmare you spin. Each winning line of Chatters, the Closet, Webster, Lump or Midnight pours in, green.

The tubes belong to you at each bet level and are kept between sessions: leave, come back next month, and both are where you left them.

Ten sheep to count. Only Dream Wheels land, and they land often.

Ten sheep to count. A Nightmare Wheel lands on every single spin.

In a night the spins are sheep. A Z on a wheel sends one more, and nothing else carries from one sheep to the next.

When both tubes fill on the same spin, the game stops and asks you. The two nights are built to return the same, so you only choose the ride. The other tube stays full and opens after your next spin.

The alarm closes every night. Warm clouds wash it away and the night's total counts up, with the sheep counted, the wheels turned and the best pipe under it. A tube that opened the night empties; the other keeps its level.

Play the demo and fill a tube

How a big win is told

A win is delivered by the factory that made it. Each side has four words, grander with every rung for a dream and scarier for a nightmare, and every letter lands on its own.

Money counts in the game's own gold numerals, and gold is never used for anything else.

Order a Sweet Dream, or a Nightmare

Either sign opens its night straight away, at one price for both, and leaves both tubes exactly where they were. Where a market does not allow a feature to be bought, the signs are not shown at all.

Nothing is a near miss

A tube one step from full gets no glow, no sound and no slower reel, and a wheel reel stops at the same moment whatever the reels before it showed. A win that does not beat the stake gets its lines and nothing else.

Where the randomness comes from

Every draw comes from the session's RandomStream, derived from the committed server seed. engine.play() is a pure function with no Math.random(), no Date.now() and no I/O, so a round from two years ago can be replayed exactly from its nonce plus the released seed. The tubes a round starts with are an input to it, recorded on the round with the tubes it ends with, so a replay of a stored round is that round; the choice when both tubes are full is a decision recorded on the round and takes no draw.

See our fairness page for how to check it yourself.

How a round is made checkable

Taking it live

What your integration lead needs to know. All of it is built and documented today.

Integration: One REST API, served in an iframe
Wallet: Wallet API v1, idempotent on our transaction id
A timeout is: Not a failure. A wallet call has three outcomes
Game recall: GLI-19 §4.14, built
Interrupted round: §4.16.3, resumed on the original key
Currencies: Any, in minor units. No floats anywhere
Languages: Rules and paytable per market, on the wire
Sandbox: A reference wallet, with deliberate faults
Player data: None. One opaque player_ref, by design

The rules of play, the paytable and the measured return per mode travel on /v1/session/open in every language we serve. They are enforced on every bet, whatever a client does with them, so a client holding its own copy cannot describe a game nobody is serving. This game is playable at /play/sleep-tight with no account needed.

Three ways to have it your way

Every operator asks for something to be different, usually late and usually as a condition. There are three ways to do it, and the first costs nothing.

A setting
~85% of what operators ask for
Bet levels, feature toggles, and which drawn skin your licence is served. It is a row in the database and goes live the same day. A key that is not declared on the version cannot be overridden: the write is refused.
A pinned build
When you are not ready to re-test
You stay on the version you tested while everybody else moves on. Different operators run different builds at the same time, at zero engineering cost, because a build is a row in the database and not a branch of the code.
A variant
Rare, and priced for the work involved
A real fork of the maths or the feature set, with its own calibration, evidence pack, certification and price.

There is no branch per operator and no build per market. That is why a new market takes an insert and a certification instead of a release, and why the twentieth licensee costs what the second one did.

What we decided, and why

Every game of this kind is built against a published reference. Where ours departs from it, we record the departure and the reason for it.

39of 42 claims met

3 claims depart from the published specification. Each one is listed below with what was expected and what this game does, as recorded in the pack.

meters.size.prototypeadvisory
The specification
12 / 12
This game
56 / 22
feature.dreamZRate.prototypeadvisory
The specification
0.3
This game
0.3389
limits.maxWin.referenceadvisory
The specification
20666x
This game
10000x

the owner's approved design (GAME.md) and the reference machine's figures, read 2026-10-27

Still open
The pays are the ones the owner approved; the wheels carry the base return
The first solve moved the paytable scale, the usual lever, and landed at nearly ten times the pays the owner approved on screen: those pays were sized for a twelve-step tube, where the bonuses carry the return, and with a bonus once in about two hundred rounds the base game has to return about half the stake by itself. A paytable ten times the approved one is a different paytable. So the lead rung holds the pays at scale 1.0 and solves how often a Z lands in the base game instead, and the wheel, the game's signature event, carries the base return. The strips were flattened slightly to bring the hit rate back toward the reference. Taken by the maths for the owner's veto, which is still open (GAME.md §18 item 12).
Decided
Both tubes full is rare, and the demo shows it from a curated round
The prototype asks the player to choose a night when both tubes fill on one spin, and the round stops and waits for that decision (ADR-043, the first stepped round in the studio).
With each side opening about once in four hundred rounds, both filling at once is about 1 in 228,000 base rounds in the measurement, so the moment almost never arises in play; the demo plays it from the showcase rounds, once each way. Making it a moment players meet would mean coupling the two tubes, which is a change to the rules, not a lever.
Still open
A new player's tubes are empty, and the value is in the tubes
A persistence game has no single per-round return.
The published 96.29% is the stationary expectation over the two tubes: the long-run return of a player who keeps playing at one bet level. A round started with both tubes empty is worth 48.0%, and the rest is in the tubes, which belong to one player at one bet level and persist between sessions. The platform has no store for that state: the demo carries the pair itself round to round, and real-money play waits for a platform table keyed on the operator, the player reference, the game and the bet level (GAME.md §9.6, §18 item 6). The per-state values, including those above 100%, are disclosed rather than hidden, and what a laboratory wants the rules page to carry is a question for the laboratory.
Still open
No clean-room second engine
The games a second engine covers are verified by packages/math-verifier (ADR-034), an independent implementation built from GAME.md and PRNG-SPEC.md that shares no code with the engine.
There is no adapter for this game. What checks its derivation is the witness: long sessions of real rounds through the SAME resolver, carrying the tubes round to round as the platform will, with no model in the arithmetic. That catches an error in the derivation and cannot catch one in the resolver, because both sides share it.

Where this game stands

What is done, what comes next, and what a real-money launch is still waiting for.

Done
The maths, measured end to end940,722,740 rounds, by the engine that wrote this pack
Done
The published specification, checked claim by claim39 of 42 met, every deviation recorded with its reasoning
Done
An evidence pack per rung of the ladder1 of 1 complete
Done
The generator's own battery96 million draws against the real stream, composed across runs. The generator is shared, so the battery is re-run when the generator changes and never when a game does
Done
The cabinet, on every screena phone upright or turned, a tablet and a desktop, each on a plate painted for its own shape, in all three worlds
Next
Installed on the round enginethe maths was measured on a staged build, and the round engine does not serve it yet
Next
A place for each player's tubesthe tubes persist per player and per bet level, and the round engine has no store for that state yet; real money waits for it
Next
A laboratory engagementthe dossier is assembled and no laboratory has been engaged yet. What it needs is a purchase order, not engineering
Then
A market certificate, per jurisdictionfour to eight weeks after submission, and the last step before a real launch

No laboratory has certified this game. Everything above is our own measurement, produced by our own engine. It has not been tested by GLI, BMM, eCOGRA or iTech Labs, it holds no market certificate in any environment, and the server refuses a real-money launch without one. The demo replays recorded rounds of this same measured maths, with no money in or out.

Taking it further

Want Sleep Tight on your floor?

Tell us which markets you hold and which rung you need. We will send back the figure with its interval, the pack it came from and a realistic date, including one for the certificate, which does not exist yet.

Email us about this game The one-page sheet The platform (future)

hello@getawaygaming.com · To pass this game on to a colleague, send them /games/sleep-tight/sheet.

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One night, two factories

You're asleep, and neither side has you yet.

Nimbus won the night.

Midnight won the night.

One dream maker, one nightmare brewer

Professor Nimbus

Mister Midnight

Where it can go

The game, dimensioned

The figures

The RTP ladder

Every wager, and what it returns

How it plays

Five reels, four rows, fourteen lines

Every Z is a wheel, and every wheel pours into the pipe

The order is part of the sum

A race between two tubes

How a big win is told

Order a Sweet Dream, or a Nightmare

Nothing is a near miss

Where the randomness comes from

Taking it live

Three ways to have it your way

A setting

A pinned build

A variant

What we decided, and why

The pays are the ones the owner approved; the wheels carry the base return

Both tubes full is rare, and the demo shows it from a curated round

A new player's tubes are empty, and the value is in the tubes

No clean-room second engine

Where this game stands

Want Sleep Tight on your floor?

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