Mastermind 3d is a free puzzle game you can play instantly in your browser — nothing to install, no sign-up and no account, and it works on a phone as well as a desktop. Controls: Crack the hidden color code within 8 rounds.
Originally by joeseesun · MIT licence · source
Yes. Mastermind 3d runs entirely in your browser on arcadefork - no download, no account, no payment.
Mastermind 3d is an open-source project by joeseesun, published under the MIT licence. The original source is linked from the credits page.
It is served as a normal web page, so it scales to your screen. If it needs a keyboard, the on-screen controls are still there.