Until recently, open-world games were developed primarily for traditional gaming platforms since creating an open-world game in a browser has always been too expensive in terms of beating off the resources spent. Times change though, and so do developer's capabilities. This page contains free online open-world games that can be played with no download or sign-up required. Since in-browser open-world games still are rare things, you shouldn't expect gameplay wonders here. If you have a weak PC though or it's just a gamer's interest that wins you over, these games can surprise you in a very good way!