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Robert Patterson, a mathematics professor at the University of Pennsylvania, sent a cipher (coded message) to his friend Thomas Jefferson in 1801, recently it was solved by a math professor in Princeton, NJ containing a message referencing the Fourth of July. Happy & Safe Fourth! Read more about the message.
 
Hotel 626 10/13/2008
 

Hotel 626 is clever online puzzle game presented by Doritos just in time for Halloween. You can only enter Hotel 626 from 6 p.m. to 6 a.m. (though you can change your computer’s clock if you want to cheat the system), and you’re not allowed to exit until you have gone on a harrowing journey through the haunted hotel. If you have a webcam and microphone you can enhance the experience,  you can also skip sections if you get stuck. Have fun, but keep in mind this may be too frightening for younger children.

 
Snow Globe 12/16/2007
 

OfficeMax is also bringing back nine popular online holiday games that
were first introduced during the 2006 holiday campaign. In addition to
ElfYourself.com and ScroogeYourself.com the other sites include:

Reindeer Arm Wrestling (http://www.ReindeerArmWrestling.com)
Roast A Turkey (http://www.RoastATurkey.com)
Greetings from the North Pole (http://www.GreetingsFromTheNorth.com)
Shake the Globe (http://www.ShakeTheGlobe.com)
Yes I'm Working (http://www.YesImWorking.com)
Don't Shoot Your Eye Out (http://www.DontShootYourEyeOut.com)
Save the Snowman (http://www.SaveTheSnowman.com)
Faux Charity Donation Generator (http://www.FauxCharity.com)
North Pole Dancing (http://www.NorthPoleDancing.com)