This is SSGP (Simplified Scratch Graphics Pipeline) rendering Suzanne (the Blender monkey). This project is based of ‘Engine From Nowhere’ which is possibly the fastest true 3D perspective render engine on Scratch. Uses normal WASD movement controls. Q/E controls camera roll with Yaw and Pitch controlled via mouse. See the original Engine From Nowhere demo that's more demanding: https://scratch.mit.edu/projects/1375357685/