We implemented the game of Sudoku using Verilog on a Nexys3 board. We had classic Sudoku puzzles as well as Chess Sudoku ones.
The player selects numbers, resets the current game, and can go to the next game by controlling a keypad. The player can move up, down, left, right, and pause using 5 buttons on the Nexys3 board.
The game displays on a monitor using a vga display controller, implemented by vga.v.
We track the time for a given puzzle and display it on a 4-digit 7-segment display.
To store the puzzles, we encoded the grid into a 324 binary string where each of the 81 squares is represented in BCD.
s = ''
for r in range(9):
for c in range(9):
s += bin(puzzle[r][c])[2:].rjust(4,'0')-
vga.v is modified from https://community.element14.com/technologies/fpga-group/f/forum/20876/draw-vga-color-bars-with-fpga-in-verilog
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Decoder.v is taken from https://digilent.com/reference/programmable-logic/nexys-3/