While a research I found some very old browser games I developed many years ago:
The Blind People Simulator
A JS/DHTML Game from 1997. Does anyone knows Netscape today 😉
For this we got a small article in a PC magazine and one or two angry mail how we can make funny games about disabled people.
A small Flash game like „Punch the monkey“. Try bill, santa or general as secret codes.
No guarantee that they will work in modern browsers.