Nuclei is a very interesting logical game that you can play on www.games501.com for free. You can gain points through letting the green balls into the center of the shield. What’s more, you can get points by preventing the blue balls into the shield. You will lose 10 points per ball if the blue balls get into the shield. Use arrow keys to rotate the shield. The time is limited and only three minutes. More detailed instructions are available in the game.
