WWI Quizzes and Trivia Games.

http://www.triv.net/html/Users7/u17815.shtml - Watch out if you get one wrong you have to start all over.
http://www.schoolhistory.co.uk/quizzes/wwi/outbreak.htm - Easy to do

http://www.historyteacher.net/EuroProjects/ExamReviewSheets/MatchingQuizzesForFinalReview-2001/MATCH-WW1.htm - Tough one.

http://www.thecorner.org/hists/ww1q.htm - Easy

http://www.historyteacher.net/APEuroCourse/EHAP-Quizzes/WorldWarI-1.htm - Pojer

http://www.historyteacher.net/APEuroCourse/EHAP-Quizzes/WorldWarI-2.htm - Pojer