Castle Quake 2

Quake 2 levels and gameplay, rendered and played with Castle Game Engine. Ships with the Quake 2 shareware demo; loads a full baseq2 install.

Play in the browser Download for Windows / Linux

The browser version runs via WebAssembly and WebGL 2. Click the viewport to lock mouse look.

Castle Quake 2 at the start of demo1 with lightmaps, view weapon and the Quake 2 status bar

Controls

WASD to move, mouse to look, Left Click or Ctrl to fire, Space to jump, C to crouch, E to use doors and buttons, 1–9, 0 or the mouse wheel to switch weapons (Blaster … BFG10K), F1 for noclip, F12 for a screenshot, ~ for the console, Esc for the menu.

How Quake 2 maps onto Castle Game Engine

Quake 2 system	Castle Game Engine implementation
BSP world (IBSP v38)	Faces batched per WAL texture into `TIndexedTriangleSetNode` shapes in a `TCastleScene` with precise collisions.
RGB lightmaps	Packed into an atlas and applied with `TMultiTextureNode` (`MODULATE2X`); models are tinted with the light sampled from the BSP below them.
Skybox	`env/*.tga` faces in a `TCastleBackground`.
MD2 models	Unwelded meshes with interpolated frame animation and PCX skins.
Doors, plats, buttons, trains	Brush models in `TCastleTransform`s driven by Quake 2 target / trigger chains.
Weapons	All 10 weapons plus hand grenades, chaingun spin-up; hitscan via `WorldRayCast`, projectiles, splash damage, railgun trails as `TBillboardNode` particles.
Audio	PAK WAVs through `TCastleSoundSource` for 3D positional sound.
HUD	Original `pics/*.pcx` numbers and icons drawn with `TDrawableImage`.

Game data

Quake 2 demo: bundled (demo1–demo3), redistributed under id Software's demo license.
Full Quake 2: put baseq2/pak0.pak (Steam / GOG / CD) next to the executable or pass -basedir.