カビが育つまでHow Mold Grows浴室の壁の上で、カビが生まれて増えるまでFrom a spore to a spreading patch on a bathroom wall
乾きに強いカビだけ育つonly dry-tolerant molds growクロカビも育つblack mold grows tooぬれている（水の膜）wet (film of water)どのカビも育たないno mold can grow
くわしい数More numbers
カビの図鑑Mold guide
家でよく見るカビと、カビに似たもの。種類を選ぶと、顕微鏡で見た形・目で見た様子・育つ条件が見られるMolds often seen at home, and something that looks like mold. Choose one to see its shape under the microscope, how it looks to the eye, and the conditions it needs
使っているもの: 文字に Zen Maru Gothic・Zen Kaku Gothic New・IBM Plex Mono（SIL Open Font License）。
What you can do in this app
How to play
Move time forward: use ▶ and the speed (1 hour to 1 week per second) at the bottom. Every night at 9 pm someone takes a bath and the wall gets wet.
Try tools: pick a tool on the left and trace over the wall. They are grouped into “Dry it / remove food”, “Kill / hold back mold” and “Make it worse (experiment)”.
Zoom in: wheel, the + button or two fingers. Zoomed in, it switches to a microscope view where you can see hyphae and spore stalks. Once zoomed, use “Look / move” and drag to move around.
Check how things are going: the top right says “getting worse / getting better / worries remain” with reasons, and the effect of the last thing you did.
Change the view: “Show hidden things” shows fallen spores, hyphal tips and anti-mold agent; “Show dampness” shows where it is damp enough for mold to grow.
How it works, and cautions
This is a simplified simulation for learning. It cannot be used for health or medical decisions, or to inspect a building. Follow the product instructions for any cleaning chemical, and never mix chlorine products with anything acidic.
The growth conditions (the lowest dampness and the temperatures at which mold grows), germination, hyphal growth, spore production and how the chemicals work are based on research and product labels. Speeds and amounts (how fast hyphae grow, how many spores, how deep chemicals reach) are estimates based on lab values, and in a real bathroom they can differ several times over.
Each hypha in the picture actually stands for a bundle of dozens of hyphae. The shapes of stalks and spores in the microscope view are simplified versions of the typical shape of each kind. The mist, foam and splashes when you use a tool are drawn to make it clear what happened (for show).
Labels: confirmed confirmed by research or product labels estimate rough value, wide range for show drawn to make it easier to see
Main sources
Fonts: Zen Maru Gothic, Zen Kaku Gothic New and IBM Plex Mono (SIL Open Font License).