Sudoku puzzle - from easy to hardcore... Fully random generation with a choice of field size and difficulty.

• Possibility to choose size from 3x3 to 9x9.
  
• The choice of complexity from 1 to 9 (a certain analogue of the probability of an empty cell from 10% to 90%).
  
• As the level of complexity increases, several solutions appear.
  
• Since In this version of Sudoku there is a choice of size, the rule of small composite squares 3x3 as part of a full 9x9 does not actual.