Classic DOS FPS
Doom II
The 1994 sequel — 32 levels of hell on Earth, plus the one weapon that needs no introduction: the super shotgun. Running in your browser through DOSBox.
Mouse look & shoot · ←↑↓→ / WASD move · Ctrl / Click fire · Space use · Shift run · 1–7 weapons · Ctrl+F10 release mouse
First load downloads the emulator and game (~6 MB) and caches them. If the screen stays black, click it once and wait.