History Games!

http://www.bbc.co.uk/history/interactive/games/ (Looks like some good games! Check out the Viking game!)

http://www.besthistorysites.net/index.php/games-animations (Looks like more good stuff! Check out Battle of Hastings!)

http://www.sporcle.com/games/category/history (A variety of games)

http://www.kongregate.com/search?q=world+history (32,000 history games?)

http://dynamo.dictionary.com/search/world%20history (Puzzles games and such)

http://playinghistory.org/ (Some of these games are online, others are not Chromebook compatible)

http://www.bbc.co.uk/schools/worldwarone/hq/trenchwarfare.shtml (WWI trench warfare game)

http://www.shockwave.com/gamelanding/this-day-in-history.jsp (Chronology game with important events from this day in history)

http://www.mission-us.org/ (Early US History...registration required)

http://www.gamesgames.com/game/test-my-history (Place the events where they belong on the timeline)

http://www.wartgames.com/themes/americanhistory.html (American history games)

http://www.havefunwithhistory.com/activities/ (Looks like mostly US history stuff)

http://www.history.com/games/ (Does not look especially educational for something coming from "history.com"...Thanks reality TV...)

http://kids.nationalgeographic.com/games/ (Also does not look all that educational...)

http://www.lumosity.com/ (Brain training)

http://dynamo.dictionary.com/ (Also linked above, but this covers all subjects)

http://www.brainpop.com/free_stuff/ (Free games from all subjects)

http://www.brainpop.com/socialstudies/ (Not free)