WASD to move around, Arrow Keys to look around, and space to jump. If you want to make your own game or whatever idk, just go inside and look at the "Render" custom block where you can add a "Draw Line Between" block to well, draw lines. Also the "Add Collisions" block under it is well, you can add collisions with the "Add Hitbox (X or Y; The X one adds a Hitbox along the x axis like a wall and the Y one adds basically like a floor hitbox)" block. You can also change the color of it too.
Some random tutorial not sure which one it was a while and I'm going to try and modify it to add Tri filling once I find how to do it with Z clipping