Optional
Take your desk to any device.
An account syncs your progress between your phone, tablet and computer. It is optional, and it is only for adults.
Passkey sign-in
Your account
Accounts need JavaScript
Everything else on the site works without it.
Checking for an account…
Accounts are not switched on here
This copy of the site has no account service. Your progress saves in this browser as usual, and the export code on My Desk moves it to another device.
Been here before
Sign in
Use the passkey you made on this site. A passkey saved in iCloud Keychain, Google Password Manager or another passkey manager works on your other devices too.
Lost your passkey?
This browser does not support passkeys. Your progress still saves here, and the export code on My Desk moves it to another device.
Keep this somewhere safe
Your recovery code
If you ever lose every passkey for this account, this code signs you in once. It is shown only now. Anyone with the code can open the account, so keep it private, the way you would a spare key.
Sync
Your desk is synced
Checking…
Progress from each device is merged: the higher XP, the furthest topic state and every badge are kept. Nothing is overwritten.
Passkeys
How you sign in
Your data
Download, sign out or delete
The download holds every record the server keeps for this account, as JSON.
Delete my account
Kept to the minimum
What an account holds
What it keeps
Your progress desk (the same XP, levels, badges and topic states this browser already saves), your passkey's public half, and the dates you made the account and last used it.
What it never asks for
No email, no name, no password and no birth date. Your passkey stays on your device, and only a one-way fingerprint of your network address is kept, for an hour, to slow down abuse.
Leaving is one click
Download everything the server holds, or delete the account and all of it at once, from this page.
Still optional
No account? Nothing changes.
Every lesson, quiz and game works the same without an account. Your progress saves in this browser, and the export code on My Desk moves it to another device. An account only adds automatic sync.