You can now play 2,400 MS-DOS video games in your browser. There are number of different types of games. There are arcade classics like donkey kong and pac man. There are educational games like the Oregon Trail. These games are played through a MS-DOS emulator that runs completely in your web browser.
Pacman and Donkey Kong you might remember from their heyday. The Oregon Trail is a historical software game. Its goal is to provide you with a cursory understanding of difficulties that people who traveled over the Oregon trail faced. You are given a small amount of money and you use that to prevision your trip. You then face challenges as you travel over the trail and hopefully you are able to overcome the challenges or you die and have to try again.
The games and emulator are hosted at https://archive.org/details/softwarelibrary_msdos_games. The Internet Archive’s goal is to preserve the history of the internet. They provide the wayback machine which allows you to look at any web site as it changed through time. It can show you what yahoo looked like in 1995.