We have changed our website to Always-on SSL Encryption to ensure everyone can access and use our website more safely.
Along with that, our URL has changed as follows:

(Old) http://iisee.kenken.go.jp/
(New) https://iisee.kenken.go.jp/en/

* If it is registered as 'Bookmark' or 'Favorite', please re-register with the new URL. Sorry for the inconvenience.