Cool online toys

There are a lot of cool toys online.
Unfortunately, it was not possible to see a good list. I propose to create such.

Here are some favorites:

• Dolphin Olympics . Allows you to make cool feints dolphin. Tower Desktop . Build mazes of towers for the flow of enemies. Strong toy, it is played thousands.
  Very cute toy to calm the nerves "Support the deer", cool drawn: http://vvw.ru/foto2007/november/08/oleni.html
  To warm up the brain - a set of puzzles: http://vvw.ru/foto2007/november/02/game.html
  And the joke to keep the square from contact with four others (test reaction): http://www.wwk.kiev.ua/squares.html