What Hiku is
Hiku is a number puzzle by Rubberduck. It comes as an app for iPhone and iPad, as Daily Hiku on hikupuzzle.com, as an embed on other websites, and as an app in ChatGPT and Claude. These terms apply to all of them.
Free to use
Daily Hiku is free, with no account and no ads. The app may later offer more levels for a price. Purchases are made in the App Store and follow Apple's terms.
Embedding
Websites may embed Daily Hiku for free, as described on the page for publishers. The link to the app must stay, and the game must not be changed or presented as something else.
The boards and content
The boards, the name Hiku, the texts and the look belong to Rubberduck. You may share your results freely, but not copy the boards in bulk or build services of your own from them.
No warranty
We do our best to keep Hiku working, but give no guarantee that it is available or free of errors. As far as the law allows, we are not liable for losses arising from its use.
Changes
We may change the game and these terms. The current version is always here. Last changed 8 October 2026.
Contact and law
Questions go to es@rubberduck.no. These terms are governed by Norwegian law.