Slots with the math showing.

Five slot worlds on our reels, and Vampir: Graveyard Shift is already live on Stake. Watch it play, poke every mechanic, run the numbers yourself. Then decide if we're any good.

Play Vampir on Stake Watch a 25,000× max win

Vampir plays for real on Stake; our own demos run on play money. 18+.

The lineup.

One live, one next up, one in production and two art kits waiting for a brief. Every game gets its own mechanic, its own screen and a hero players remember.

Bats that grow. Bats are wild, stay on the board through every tumble and gain +1 each time it drops. Here two of them climb to ×5 and ×7 in six tumbles.

Captured from the live game build: real rounds from the published books. Play it for real on Stake. 18+.

Live on Stake Engine

Vampir: Graveyard Shift

Uncle Vlado took the only job that fits his hours: night watchman at the village graveyard. His bats do the real work. They grow with every tumble, and when Vlado gets peckish he bites the board and doubles them. Free spins are one night shift, on the clock.

Board
6×5, scatter pays, tumbles
RTP
96.50% in all 5 bet modes
Max win
25,000×
Free spins
1 in 320 spins
Hit rate
1 in 3.21 spins
Bet modes
1×, Night Owl 2×, buys 100× / 300× / 1,000×
Play it on Stake Gameplay & case study Math sheet (PDF)
In-game capture, play money. The rakia pours, the spots climb, the batch gets big.
Next release

Rakia Lab

Grandpa Pesho distils rakia from anything that grows. A Bottle Wild tips over and the rakia runs down a 7×7 glass grid. Every cell it soaks climbs the proof ladder from x2 to x100, and up to x500 in free spins, when the lab floods row by row.

Board
7×7, cluster pays, tumbles
RTP
96.00% in all 5 bet modes
Max win
25,000×
Free spins
1 in 250 spins
Hit rate
1 in 2.5 spins
Bet modes
1×, Strong Batch 1.5×, buys 100× / 300× / 1,000×
Ask about Rakia Lab
In production

Thracian Gold

Torch-lit tombs and hammered gold on 5×3 with 20 lines. Masks dig through the Mound's chambers in free spins, ×2 to ×10, and Horseman Charge wilds ride through the base game. Phones get their own portrait layout, not a shrunk desktop.

Thracian Gold base game on 5×3
Base game
Horseman Charge wilds riding across the reels
Horseman Charge
Epic win screen in hammered gold
Epic win
Thracian Gold portrait layout on a phone
Phone layout
Balkan Dragon UI kit: buttons, frames and panels
Art & UI kit

Balkan Dragon

6×5 pay anywhere. The global multiplier grows with every tumble, then the dragon burns the low symbols for one last drop. The art and the UI kit are done, ready to build on.

Moon Nymphs: the moonlit glade behind the reels
Art & UI kit

Moon Nymphs

7×7 cluster tumbles in a moonlit forest. Every symbol has a light set and a dark eclipse set for the duel feature, and the Samodiva is already animated: that's her in-game idle loop. Hover for her spell.

Pocket slots, private demos.

Our own small slots, each built around one mechanic. Their demos are private: we share them with operators on request, along with the math. The case studies are open to everyone.

Loading the game

Lucky Chip 7s

Hold & Win on 5×3 with 20 lines. Six coins lock, three respins, every new coin resets them. Fill all fifteen for the GRAND.

  • 96.0% RTP, exact
  • Medium volatility
  • 5,000× cap
Request the demo Case study
Loading the game

Gem Cascade

6×5 pays anywhere with tumbles. Bombs add their values and multiply the whole sequence; in free spins the total keeps growing.

  • 96.0% RTP, 400M spins
  • High volatility
  • 10,000× cap
Request the demo Case study
Loading the game

Rocket Reels

1,024 ways on 5×4. Fuel coins fill a tank; a full tank, or three rockets, launches a cash-out round where you pick the moment to bail.

  • 96% RTP
  • 1,024 ways
  • 5,000× cap
Request the demo Case study

Nine mechanics, acted out.

The staples every lobby runs on, played by symbols from our own games. Pick one and watch. These are scripted to show the rule, not real spins.

    In our games

    How a slot gets built here.

    1. GDD.md · Vampir: Graveyard Shift · v0.1

      Pitch

      Uncle Vlado is a Balkan vampir who took the only job that fits his hours: night watchman at the village graveyard. His bats do the real work. Every win they help with makes them stronger, and when Vlado gets peckish he bites the board and doubles them. A free-spin round is one night shift, 21:00 to 07:00.

      Title check

      No slot called “Graveyard Shift” found. “Night Shift” was taken, so it was dropped.

      1

      Concept

      One hook a player gets in a sentence, one hero, one mechanic nobody else has. Then a title check against what's already out there, before anyone draws a pixel.

    2. // Vampir math sheet, final stats (100,000 books per mode)
Mode           RTP      Std/cost  Max win odds
Base 1×        96.500%  14.77     1 in 6,250,006
Night Owl 2×   96.500%  11.05     1 in 3,125,001
Shift 100×     96.500%   2.13     1 in 50,000
Overtime 300×  96.500%   1.35     1 in 19,984
Blood Moon     96.500%   1.21     1 in 2,500

✓ Stake critical tests: all pass
✓ 3-star checks: 0 failed classes
✓ 500,000 books replayed: 0 failures
      2

      Math

      Every bet mode simulated on its own, optimised into the RTP band, then every book replayed against the rules. If the numbers don't add up, the art waits.

      Read the whole sheet (PDF)
    3. Rakia Lab style test: painted Rakia Lab style test: cartoon Rakia Lab style test: 3D render
      3

      Art

      Three looks tested on the real 7×7 board before a single final asset. Painted won. Then every symbol, hero and button in one style and one light, so nothing looks borrowed.

    4. Spine rig, first test
      Filmed loop that shipped
      4

      Animation

      A rig bends a painting, and Vlado looked bent. So we filmed him instead: real motion, keyed to transparent loops for idle, wins and the bite. Symbols get their own win loops.

    5. 5

      Front-end

      A WebGL client that animates what the round's events say, and nothing else. The liquid in Rakia Lab is a real shader. Then a juice pass, because a win nobody feels is a win nobody remembers.

    6. Vampir, our pre-submission review
      CurrenciesEUR, USD, CAD, MXN, JPY with 0 decimalsPass
      Sweepstakes coinsSC and GC, no $ anywherePass
      Popout 400×225Buy card covered the menu. Fixed.Pass
      Phone 425×812Logo, buttons and info line fitPass
      Unknown languagelang=zz falls back to EnglishPass
      6

      Review prep

      We run the platform's guidelines against our own build first: every screen size, currency and wording mode. Vampir's first pass found two fails. We fixed both, then submitted. Approved, live.

    Same RTP. Very different night out.

    RTP is the long-run average. Volatility is how bumpy the road is. Two of our demos both return 96.0%. Send thirty players into each and watch their balances.

    Spins each

    Everyone starts with 100 bets and plays 1 bet a spin. The simulator runs the same math files the demos play, with your browser's crypto random numbers.

    Lucky Chip 7sRTP 96.0% · medium volatility
    Ahead at the end
    –
    Ran out
    –
    Median balance
    –
    Biggest spin
    –
    RTP this run
    –
    Gem CascadeRTP 96.0% · high volatility
    Ahead at the end
    –
    Ran out
    –
    Median balance
    –
    Biggest spin
    –
    RTP this run
    –

    Now spin it 250,000 times.

    A session is noise. Run a quarter of a million spins of each game and watch both settle toward 96%. The bumpy one takes longer to get there, which is volatility in one picture.

    Published figures: Lucky Chip 7s 96.009% (exact, closed form), Gem Cascade 96.047% ± 0.063% (400 million spins).

    Four of our games on one ruler.

    Standard deviation per spin, in bets. Same RTP band, four very different temperaments.

    How to read a game sheet, with a real one.

    Vampir's base game, straight from its math sheet. Every number below is computed from the published books, not estimated.

    Vampir math sheet (PDF)
    96.50%RTP
    Over the very long run, 96.50 back for every 100 played. In every one of the five bet modes. It promises nothing about tonight.
    1 in 3.21Hit rate
    How often a spin pays anything at all, including wins smaller than the bet.
    1 in 4.50Stake or better
    How often a spin pays back at least the bet. The honest cousin of hit rate.
    14.77Std. deviation
    Per spin, in bets. The bumpiness: longer quiet spells, bigger spikes.
    1 in 320Free spins
    The Shift lands about once in 320 spins and is worth 115.6× the bet on average.
    25,000×Max win
    Reached about 1 in 6,250,006 base spins, or 1 in 2,500 Blood Moon buys. A cap that actually gets hit.
    46.7%Sessions with a Shift
    Of 20,000 simulated 200-spin sessions, this share saw free spins. The other half didn't.
    16 spinsLongest dry spell
    Median longest run without a stake-or-better spin in those sessions. We tuned the base game for this.

    For operators: plug it in.

    Built for Stake Engine first, ready for your RGS on request. Here is what lands on your side of the table.

    Integration

    Stake Engine, native

    Math SDK books and lookup tables for every bet mode, a client that plays the round's events, replay mode and social wording. Exactly how Vampir ships.

    Any RGS, on request

    The client only animates outcomes, so we write the adapter for your API and hand your QA a local mock server serving real rounds.

    Localisation

    Every string lives in a language file, none is painted into the art. lang= picks the language; an unknown code falls back to English. Casino and social / sweepstakes wording from one build.

    Currencies

    Money is an integer all the way through, then formatted per currency.

    • EUR
    • USD
    • CAD
    • MXN
    • JPY 0 decimals
    • SC
    • GC

    Tested before Vampir's submit.

    Every size a reviewer opens

    1280×720 1024×576 800×450 400×225 425×812

    Drawn to scale. The little one is the popout reviewers love; it's where Vampir's buy card failed, once.

    What lands in your inbox

    • MathPublish files per bet mode, the report and the code to reproduce it.
    • ClientA static build ready to upload, plus the source.
    • Reviewer notesRules, features, bet modes, RTP and max win, written for the reviewer.
    • DemoA play-money build against a local server, replays included.
    • Store mediaTiles, covers and logos, like the ones at the top of this page.
    All the tech specs

    Got a gap in your lobby?

    A custom title, a reskin of one of ours or a hand on yours. Tell us the market and the RTP; we'll come back with a mechanic.

    Start a slot briefAsk on Telegram

    Play it on Stake