Math Games and Logic Puzzles


Move balls to make all except two white. See below in comments the proof why it is not possible to make all balls except one white.

  • Select one position, then another. If the two balls selected have no colors in common, then a ball with the colors combined will be placed in the second position selected, and a ball with the second color will appear in the first position. For example, if you move red to green, then on the second place there will be red/green and on the first place - green. So, the order of moving matters.
  • A white ball appears when a two-colored ball is merged with a ball of the remaining color (e.g., a red/green ball merged with a blue ball).
  • Merging with a white ball does not change the color, and on the place of white the second color will appear. For example, white and green will give green and green.


Fill in the cells with numbers to make all equalities correct.

The cells with the same background should have the same values.


Start from the top left corner and move (as a knight in chess) to get the highest score.

Click on a cell to make a move.

You can't move on cells with zero values.

Avoid cells with negative values!

You can only make a move like a knight in chess:


Complete the crossword by filling the cells with letters.

You're given 8 letters. 6 of these letters (and only they) are in the crossword. The other 2 letters are not.

The cells with the same background should have the same letters.


A well-known game where you need to fill the cells with digits from 1 to 9.

You can enter your own puzzle or generate one.

No row, column, or square can contain repeating digits.