There are two ways to create a game in Quest:
- You can create your game online, then download the finished quest file.
- You can download Quest from http://textadventures.co.uk/quest, create the game on your computer and save the quest file. The downloadable version of Quest is only available for Windows.
In both cases, you can upload the finished quest file to your itch.io game page and people can download it from there, but they also need to download Quest to play it.
If you want people to be able to play your game online, you can upload it to the Quest web site (at the link above) 24 hours before the submission deadline and provide a link to the game on your itch.io page.