Concentration 1.0.0-3

What's New in 1.0.0-3
Added a fullscreen toggle button to the main menu.
Added F11 keyboard support for toggling fullscreen.
Added Escape keyboard support for leaving fullscreen mode.
Preserved the active game board and timer when changing display modes.
Installation

Download concentration_1.0.0-3_all.deb and install it on a compatible Debian-based Linux system with:

sudo apt install ./concentration_1.0.0-3_all.deb

Dependencies, including the Papirus icon theme, are managed by the package manager.

Full Changelog: 1.0.0-2...1.0.0-3