grub-invaders software package provides multiboot compliant kernel game, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install grub-invaders
grub-invaders is installed in your system.
Make ensure the grub-invaders package were installed using the commands given below,
$ sudo dpkg-query -l | grep grub-invaders *
You will get with grub-invaders package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Kernels |
| Package | grub-invaders |
| Version | 1.0.0-13 |
| Description | multiboot compliant kernel game |
| Sub Section | Kernels |