Star catcher with a joystick is a ready-made Basys 3 FPGA game written in Verilog. It uses Digilent PmodJSTK on JA (SPI). Play it free right in your browser - nothing to install, no FPGA board needed.
How to play
Move the ring onto the star: drag the joystick on the card, or keys I J K L, or a USB game controller. H = stick press (yellow ring), U = BTN1 (bigger ring). btnC resets the score.
What it uses
Verilog · Digilent PmodJSTK on JA (SPI)
The code: download the Verilog project (.zip) — read it, change it, and run your version with the free PC program.