WebSocket server for crazy small 3D5FT / 6A5FT of cooyou.org. Connect the device to your smartphone with OTG and operate as a WebSocket server with preset C.
There is also a link to the table tennis rally training VR simulator that runs on your browser, so you can click it to open it in your browser and play.
There are also full screen mode and smartphone VR mode.
Especially, you can easily play without using Crazy Small. For details, please read the Japanese commentary link on the screen of the table tennis rally training VR simulator.