Escape the Room! ARROW KEYS to move around room. Then MOUSE - click on a wall to move to and interact with it. (Arrow keys to move away again.) Tip: start by looking around - there are 12 walls..
Did an actual escape room for the first time the other day - quite fun. Remembered the excellent escape room project by @maciom7. This one has a 3D element to it. It's not a raycaster and it doesn't use a triangle-filler - just some improvised methods based on the idea that rough edges don't matter if they're covered by the next thing you draw. Thanks very much to @imeatingchocolate for curating this.