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• Normal sudoku rules apply.

  • For each row, column and box, 1~9 appear exactly once.

• Digits must not repeat in a killer cage. The digits in the cage must sum to the given total in the top left corner (if given).

• Digits on a thermometer must strictly increase as they move away from the bulb.

• Digits along an indicated diagonal must sum to the given total. The given totals are some dates in chromeOS history, in "month/day/year" format. For example, 10/11/12 is "October 11th, 2012" and 3/4/5 is "March 4th, 2005". All the answers can be found on chromeOS wiki page.

  • Google announced chromeOS on X/Y/Z.

  • Google announced (the first) two Chromebooks at Google I/O on D/E/F.

  • The first Chromebook model was released on A/B/C by Samsung.