This game's core logic flows from input, with the CommonLabel::Input system label, into actions, with the CommonLabel::Action system label.
To explore these systems, begin at src/main.rs and start exploring the plugins.
Input systems are found in the src/input/ folder, while action systems are found in either src/logic/ or src/graphics, depending on whether they control the gameplay-relevant logic or the display.
The user interface of this game is split into two sections: the Sudoku board, and the supporting button, and this split is reflected in both the src/input and src/graphics folders.