No. Lessons, puzzles and games against the computer work offline and without an account. A free account adds online play, friends, tournaments and saving your progress on the server.

On the home screen open “My account”, then choose “Create account”, “Sign in”, “Continue with Google” or “Continue as guest”. A guest can create an account at any time and keep everything they have done.

In “Sign in”, tap “Forgot your password?” and enter your email. You will receive a link to choose a new password. If it has not arrived within a few minutes, check your spam folder.

Sign in with the same account and all your progress comes back: lessons, puzzles, opponents and achievements. A guest cannot sign in on another device, so create an account before you switch.

Open “Friends”, then give your friend your ID, or type theirs in “Add a friend”. Once they accept, you can challenge each other at any time control.

Tap “Block” or “Report” in “Friends” or in the chat. Once blocked, their messages no longer reach you, and we review every report and remove anything that breaks the terms.

Players under 13 chat with ready-made phrases only and cannot go on stage by voice. Free text is only possible between two older friends. The age group comes from the birth year alone, so a player who turns 13 this year keeps ready-made phrases until the year ends. A parent can turn off all chat in “Settings”, then “Chat in games”. There are no ads in the game.

Turn up your device volume, then open “Settings”, and in “Voice guidance” choose “Voice and text” or “Voice only”, raise “Voice volume” and tap “Test the voice”. On iPhone, turn off the silent switch on the side, as it mutes browser sounds.

In “My account”, tap “Delete account” and type the word “delete” to confirm. Your account, ID, friends and the progress saved on the server are then deleted permanently, as the Privacy Policy explains.

Thank you! Email us what happened with a screenshot. Only technical crash reports reach us so we can fix them, as the Privacy Policy explains.