Complete the first 73 sudokus in the main mode (30 for easy, 30 for medium and 13 for hard) and 25 in infinite mode.

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Completing the above levels, the infinite mode should be unlocked. This mode generates random sudokus, so solve it by yourself or find some solving program. Access to the mode is highlighted in the first image below. Complete 25 (achievements in 1, 10 and 25) to unlock the achievements. The infinite mode has three levels of difficulty, but the easy one can be repeated to get the achievements.

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