Square Wisdom: 200 CalcuDoku puzzles

My first CalcuDoku book can now be purchased on Amazon!
The book contains 200 puzzles ranging in sizes from 5×5 to 9×9. – 136 puzzles are with all operators, evenly split into the standard five difficulty levels: EASY-COOL-THINKER-BRAIN-IQ, but there are also a couple INSANE – 64 puzzles are with the (significantly) reduced number of operators, mainly THINKER-BRAIN-IQ Enjoy!
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