Is it free?
Yes. Every game is free and there is no sign-up.
Do I need to install anything?
No. Open the page in your browser and play. It works on phones, tablets and computers.
Is my progress saved?
Only your personal best and your sound setting are saved, inside your own browser (localStorage). Nothing is sent to a server. Progress within a set is not saved, so reloading the page takes you back to the first puzzle.
Do you collect personal data?
We do not collect anything that identifies you, such as your name or email address. There are no logins and no forms. To improve the site, we measure page views and similar traffic with Google Analytics, which uses cookies.
I cannot hear any sound
Browsers keep sound off until you first touch the screen. If it is still silent, check that the speaker button at the top right is not muted.
Can I play with just a keyboard?
Yes. Every game can be played with the arrow keys and Enter, and R restarts. Controls differ per game, so check the "?" button in each game.
Is there a Japanese version?
Yes. Use the "JA" link at the top right to switch.
Will there be new games?
Yes, we add them one at a time. New ones are marked "NEW" on the list.