On Debian-based systems, between apt packages and snap packages, there are plenty of options to play games. I prefer picking games that are modular, FOSS, customizable, and enjoyable. If you don’t want to wait for long updates to start gaming, these are simple games that you can spend a lot of time in.
Most of them barely take any memory on your system, and if you don’t like something in them, you can change it. Worst case scenario, you ain't losing anything since they’re free and not that hard to install.
Gzdoom (with Freedoom)
Gzdoom is a versatile game engine for Doom, supporting modding and enhanced graphics. Freedoom is a free, open-source game data replacement for Doom.
Tags: 3D, Shooter, Engine
Cube2: Sauerbraten
A fast-paced multiplayer FPS with a strong emphasis on modding and community maps, powered by the Cube engine.
Tags: 3D, Racing, Shooter
Luanti (Minetest)
Minetest is a free, open-source voxel game engine. Luanti is a mod that adds RPG-style gameplay, similar to Minecraft.
Tags: 3D, Sandbox, RPG
Super Tux Kart
A free, open-source kart racing game starring Tux the penguin and friends. It's fun for all ages!
Tags: 3D, Racing, Fun
Assault Cube
A fast-paced, multiplayer FPS with a focus on simplicity and competitive play.
Tags: 3D, Shooter, Multiplayer
Hedge Wars
A turn-based strategy game similar to Worms, featuring hedgehogs with a wide variety of weapons and tactics.
Tags: 2D, Strategy, Turn-based
CLI Games
Dwarf Fortress (Classic)
A simulation game where you control a group of dwarves, building and managing a fortress while facing challenges and dangers.
Tags: Simulation, Management, Hardcore
God of Ammock
A roguelike game combining fast-paced combat with exploration and resource management.
Tags: Roguelike, Action
Angband
A classic dungeon-crawling roguelike based on the works of J.R.R. Tolkien.
Tags: Roguelike, Dungeon-crawler
Nethack
A complex roguelike dungeon crawler where every game is different and features permanent death.
Tags: Roguelike, Dungeon-crawler
Gnuchess
A classic chess game that you can play against a computer opponent.
Tags: Strategy, Chess
Not in APT
Cataclysm: Dark Days Ahead
A post-apocalyptic roguelike survival game where you must scavenge, craft, and fight to stay alive.
Tags: Roguelike, Survival
Spelunky
A roguelike platformer where you explore caves, collect treasure, and avoid traps and enemies.
Tags: Roguelike, Platformer
PPSSPP
A PSP emulator that lets you play PlayStation Portable games on your Linux machine.
Tags: Emulator