Fast Light Toolkit - example games: checkers, sudoku This package contains the example games that accompany FLTK. Specifically, it contains the following two programs: - flblocks: clear groups of adjacent blocks before they fill the screen; - flcheckers: classic board game, also known as draughts; - flsudoku: Sudoku puzzle (place numbers in a grid). The Fast Light Toolkit (FLTK) is a cross-platform graphical user interface toolkit originally based on libForms.