Privacy
Last updated: November 9, 2026
This page explains what happens to your information when you use Shikaku at shikakuonline.com. There are no accounts, so we never ask for your name, email address or a password in order to play.
Visit measurement
Google Analytics measures visits to this site using cookies and similar identifiers. It tells us things like which pages are opened, roughly where visitors are, and what kind of device and browser they use. Google processes that information on our behalf.
Your game progress
Your saved boards, streaks, best times and mode preferences stay on your device. This is kept in your browser's localStorage, on your device. It is not uploaded to us and is not used by Google Analytics. Because it lives on one device in one browser, it does not follow you to another.
If your browser blocks this storage, you can still play, but your progress will not be kept.
Sharing a result
The share button only puts a short text summary on your clipboard or opens your device share sheet. Nothing is posted anywhere unless you paste or send it yourself.
The share and challenge buttons open your device share sheet, or copy text for you. A challenge link contains only the score, the puzzle id and, if you type one, a name of up to 12 characters. Friends' scores are shown as claimed and are stored only on your device.
Hosting
The site is hosted on Cloudflare, which processes standard request data, such as IP addresses and the pages requested, in order to deliver the site and protect it from abuse.
Advertising
The site does not currently show ads. Advertising partners may be added in future, and this page will be updated when that happens.
Clearing your data
To erase your progress and any cookies, use your browser's settings to clear site data for shikakuonline.com. This permanently removes your saved games, streaks and best times from that browser. Game data is stored under names beginning with shikaku:v1:.
Children
This site is not directed at children under 13, and we do not knowingly collect personal information from them. If you believe a child has sent us personal information, contact us and we will delete it.
Changes
If what the site does with information changes, we will update this page and the date at the top.