Marimbo · slot game studio

Slots that pop in colour.

Marimbo is a small, independent slot studio. We hand-craft bright, playful games with their own twist: easy to read, fast to play, full of character. Three originals with up to 25,000x max win are on their way.

Demo reel Marimbo 5 × 3

A free demo reel, just for fun: hit spin.

Three originals. Own twists.

  • 3 original titles in production
  • 25,000x top max win (KOI UPSTREAM and VINE HOLLOW)
  • 96.11–96.30% RTP, the same in every mode (KOI UPSTREAM and VINE HOLLOW)
  • 7 game modes per title, at most

The line-up

Our games

Three original slots, each built around a core rule of its own. None of them is released yet: this is a first look at the preview builds.

The koi of KOI UPSTREAM leaping out of a splash of water

01Coming soon

Clusters float up, the koi leaps the waterfall and every leap pushes the TORII METER higher.

6x6 clusters of 5+ pop and everything floats UP. The KOI wild rises with them; when it reaches the top it leaps through the torii and adds +1 to the TORII METER, which multiplies the whole spin.

Recorded in a preview build of the game, demo mode. Amounts shown are not player wins.
KOI UPSTREAM in portrait on a phone
Max win
25,000x
RTP
96.30%in every mode
Grid
6x6
Wins
Clusters5+ touching, floating up
Base hit rate
29.33%of spins win
Free spins
1 in 302base spins, on average

Features

  • Clusters of 5 or more touching symbols pop, everything below floats up and new symbols rise from the pond
  • The KOI is WILD, never pops and keeps rising; at the top it leaps through the torii: +1 on the TORII METER
  • The TORII METER multiplies the win of the whole spin
  • 6 or more LAMPIONS (1x to 100x) start the LAMPION BONUS with 3 respins; a koi swimming up doubles every LAMPION it passes
  • GOLD LAMPION collects all other values, LOTUS LAMPION places 2 to 4 new ones; a full board adds the GRAND of 1,000x
  • LAMPION RAIN and CURRENT can strike on any base spin

Free spins 4 / 5 / 6+ lanterns start 10 / 12 / 15 FREE SPINS; 4+ lanterns during free spins add 5 more (max 50). Koi and TORII METER stay for the whole round, LAMPIONS fill the LAMPION POT for the LANTERN FESTIVAL at the end.

Game modes × base spin

  1. Base game1x
  2. KOI SHOAL2x
  3. LAMPION BONUS75x
  4. FREE SPINS100x
  5. SUPER LAMPION200x
  6. SUPER FREE SPINS250x
  7. GOLDEN LEAP500x

7 modes: KOI SHOAL switched on with ACTIVATE, 5 feature rounds from the FEATURES menu

The scarecrow gardener of VINE HOLLOW with garden shears in his pumpkin patch

02Coming soon

Land 6 or more pumpkins for respins. Touching pumpkins grow together with vines and score their total times their count.

5x4, 20 lines. Pumpkins carry values from 1x to 100x. 6 or more start respins with 3 lives; touching pumpkins join by vine and score sum x count (2+5+1+3 = 11, four pumpkins = 44x).

Recorded in a preview build of the game, demo mode. Amounts shown are not player wins.
VINE HOLLOW in portrait on a phone
Max win
25,000x
RTP
96.11%in every mode
Grid
5x4
Lines
20fixed, plus pumpkin vines
Base hit rate
30.70%of spins win
Respins
1 in 202base spins, on average

Features

  • Pumpkins carry a value: 1x, 2x, 3x, 4x, 5x, 8x, 10x, 20x, 50x or 100x
  • 6 or more pumpkins anywhere start RESPINS with 3 lives; a new pumpkin resets the lives to 3
  • Touching pumpkins grow together with a vine: each vine scores its total times its number of pumpkins
  • SUPER RESPINS: vines also join diagonally and new pumpkins land more often
  • 9 or more pumpkins at the start: ULTRA RESPINS with 4 lives and diagonal vines
  • WILD lantern in a vine wreath stands in for every symbol except the pumpkin
  • BOOST: respins start about three times as often (about 1 in 67 spins)

Respins 6+ pumpkins start RESPINS (3 lives); 8 pumpkins from the SUPER RESPINS mode play SUPER RESPINS (diagonal vines); 9+ pumpkins play ULTRA RESPINS (4 lives, diagonal vines). Ends when the lives run out or all 20 cells hold a pumpkin.

Game modes × base spin

  1. Base game1x
  2. BOOST2x
  3. RESPINS100x
  4. SUPER RESPINS300x

4 modes, all switched on with ACTIVATE

The monkey of PAINT RIOT

03Coming soon

Every balloon paints a 3x3 splash and adds +1 to the multiplier. Same colours clash and multiply.

Clusters of 5+ win and tumble. Paint balloons burst, paint a 3x3 area in their colour and add +1 to the multiplier; a COLOUR CLASH with same-colour paint from this spin doubles it instead. Now and then a rainbow flood turns the board into one colour.

Recorded in a preview build of the game, demo mode. Amounts shown are not player wins.
PAINT RIOT in portrait on a phone
Wins
Clusters5+ touching, with tumbles

Features

  • Clusters of 5 or more touching symbols win, fall away and new symbols tumble in
  • Every paint balloon bursts, paints a 3x3 area in its colour and adds +1 to the multiplier
  • COLOUR CLASH: new paint touching the same colour from this spin doubles the multiplier
  • Rainbow flood: now and then the whole board turns one colour
  • The gold balloon paints the golden palette, the top symbol
  • WET PAINT: painted fields stay wet and colour every new symbol that lands on them

Free spins Paint tins start the FREE SPINS: the multiplier never resets during the round and keeps growing. WET PAINT: painted fields stay wet and colour every new symbol that lands on them.

Straight from the reels

Real captures from preview builds of all three games, demo mode.

  • KOI UPSTREAM: base game
  • VINE HOLLOW: base game
  • PAINT RIOT: base game
  • KOI UPSTREAM: free spins night
  • VINE HOLLOW: full hollow
  • PAINT RIOT: colour clash
  • KOI UPSTREAM: koi waterfall
  • VINE HOLLOW: ultra respins
  • PAINT RIOT: colour flood
  • KOI UPSTREAM: torii leap
  • VINE HOLLOW: vines join
  • PAINT RIOT: free spins

What we do

Every layer of the spin

A small studio, the whole stack: we shape the math, create the art, animate the symbols and ship the HTML5 build.

01 · Math

One model for every mode

Base game, boost and feature modes are modelled together and tuned to the same RTP in every mode. Outcomes are simulated ahead of time and shipped as books with a lookup table per mode.

KOI UPSTREAM: 7 modes, 96.30% RTP each
  1. 1xBase game
  2. 2xKOI SHOAL
  3. 75xLAMPION BONUS
  4. 100xFREE SPINS
  5. 200xSUPER LAMPION
  6. 250xSUPER FREE SPINS
  7. 500xGOLDEN LEAP
  • Base-game hit rate
  • KOI UPSTREAM29.33%
  • VINE HOLLOW30.70%

02 · Art

Symbols that read at thumb size

Key art, symbols and UI for 6x6 and 5x4 boards on small screens. Bright, bold and full of character.

Tanuki (KOI UPSTREAM)Sumo Frog (KOI UPSTREAM)Punk Turtle (KOI UPSTREAM)Damselfly (KOI UPSTREAM)Lantern Moth (VINE HOLLOW)Crow Skull (VINE HOLLOW)Grave Rose (VINE HOLLOW)Iron Key (VINE HOLLOW)Golden Palette (PAINT RIOT)Paint Pail (PAINT RIOT)Beret (PAINT RIOT)Golden Brush (PAINT RIOT)

03 · Animation

Built in layers, alive in real time

The Golden Brush of PAINT RIOT: handle, ferrule, bristles and the paint drop are separate layers, animated live in the game. So is every balloon that bursts into a 3x3 splash.

Separate layers of the PAINT RIOT Golden Brush symbol

04 · HTML5

Mobile first. Desktop too.

Portrait, landscape and desktop from one lightweight HTML5 build.

KOI UPSTREAM on a phone
VINE HOLLOW on a phone
PAINT RIOT on a phone

05 · Delivery

Built for remote game servers

  • Stateless HTML5 client: every round stands on its own
  • Pre-computed outcome books
  • Lookup table per game mode
  • Up to 7 modes per game, each one switched on in the game with ACTIVATE

Got a lobby? We've got the colour.

Operators, aggregators and platforms: ask us about our titles, release timing and integration. Just write to us directly.

info@marimbo.de