Super Cuber by Toyboat Games has been released on Steam and runs natively on Linux and SteamOS.

The game is a fully customizable speedcubing simulator with cubes from 2x2x2 up to 21x21x21. It costs €6.23 at launch (20% off the regular price of €7.79).

A Fully-Customizable game about solving cubes. Every size from a 2x2x2 to 21x21x21. Train your muscle memory, using refined controls for both Keyboard and Gamepads. Play casually, or hone your skills to reach the top of the leaderboard.

Standard mode Test you speed in Standard Mode. Solve every cube as fast as possible to earn a spot on the leaderboard!

Blind Mode Test your memory in Blind Mode. Once you start, there’s no going back.

Customization Customize your cube any way you want. There are endless Color and Sticker combinations!

Leaderboards Think you have what it takes to reach the top spot on the leaderboard? Go head-to-head against your friends and the world.

Source: Steam