Day 6 was "Hammer" I think. In the video is the first clue --- that Tanki had an expo somewhere in Germany. If you search it up ("Tanki expo in Germany" or something), you'll find out it was at COLOGNE. If you go to Cologne, you find a secret code. http://tankionline.com/wasp If you go on that page, there will be a puzzle. Once you complete the puzzle, there will be a picture of Thor and his hammer is covered with the Day 5 symbol. So I think the answer is "Hammer"