To play Wiki History Game just go to the site and click start. You'll then see two events on the screen. Drag them into the correct order. As soon as you do that another event will appear and you have to drag that into the correct order with the two previous events. There aren't any points awarded or any levels. The object is just to consecutively, correctly sort as many events as possible.
Here's a little video demo of the game.
Applications for Education
If you're a middle school or high school social studies teacher who is looking for a fun activity for your students to do when they have a little free time, this game could be worth linking to on your classroom website or in your Google Classroom materials section.