Toyokumono
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About the game
In Toyokumono you play a small sky spirit drifting over sixteen strips of bare earth, and your only tool is rain. Wherever you are, you can summon a cloud; it hovers for a few seconds, pours down, and the ground below gets wetter.
The trick is getting the soil exactly right. Each strip dries out slowly on its own, and a seed only sprouts when the earth is in its best condition, not too dry and not soaked. Once a plant is up, it keeps growing as long as its ground stays in good shape; let it dry out or drown it and it starts to suffer, and eventually withers. A plant that survives long enough bursts into bloom and scatters flowers. Those flowers are your score, and they also give you back cloud summons.
You start with a hundred clouds, and the counter in the corner shows how many are left. The game ends when you have run out of clouds and nothing is growing any more. Later on the wind picks up and pushes the clouds sideways, so the rain no longer falls where you summoned it. The name comes from Toyokumono, a god from the oldest Japanese myths, whose name evokes abundant clouds over fertile land.
Playing it here
This is a homebrew game made for the Arduboy, the open, credit-card-sized handheld with a tiny black-and-white screen: a new game by an independent developer, not a commercial release. It runs here in Ardens, an Arduboy emulator. Click Play now and choose Instruction on the title screen for a four-page tutorial, or Game Start to jump straight in.
The game remembers its ten best scores in the emulated memory of the Arduboy, and that is kept in this browser automatically. F2 also saves the complete state of the game at any moment, and F4 brings it back. A gamepad works too.
Controls
| Key | Arduboy button | Action |
|---|---|---|
| Arrow keys | D-pad | fly around the sky |
| X | B | summon a rain cloud; after a game, play again; choose in menus |
| Z | A | menu (continue, restart, title); after a game, back to the title |
| F2 / F4 | — | save / load the state |
A few things worth knowing
You cannot hold the rain back for long. If you do not press X, a cloud is summoned for you after a few seconds anyway. Keep moving to where the next cloud will do some good.
Spread the rain. Pouring every cloud on the same spot soaks it; the plants there will suffer. Several gentle showers across the field work far better.
Watch the wind. When it starts to blow, clouds drift before they rain. Summon them upwind of the strip you want to water.
Credits and licence
Toyokumono was designed, programmed, drawn and scored by OBONO, who has been making small games for the Arduboy since 2016, and released in April 2026 for the Arduboy community's Cloud Jam. It is free software under the MIT licence. It is built with the Arduboy2 6.0.0 library (BSD licence, plus a music player adapted from ArduboyPlaytune, MIT). The licence texts are linked from this page, and the source code is in the author's ArduboyWorks repository.