Aim Trainer (mouse) is a ready-made Basys 3 FPGA game written in Verilog. It uses PS/2 mouse on the USB port, VGA. Play it free right in your browser - nothing to install, no FPGA board needed.
How to play
Click the targets with the mouse: move over the screen with the left button. Small targets score more. 30 seconds. btnC or right-click starts.
What it uses
Verilog · PS/2 mouse on the USB port, VGA
The code: download the Verilog project (.zip) — read it, change it, and run your version with the free PC program.