Games like Keen

Here are some great alternatives to Keen by Sergey Maltsev :
Mathdoku
Mathdoku
★4.3
KenKen Classic II
KenKen Classic II
★4.5
Classic Sudoku Luxe Edition
Classic Sudoku Luxe Edition
★3.9
Andoku Calcudoku
Andoku Calcudoku
★4.7
Guriddo: Daily Number Puzzle
Guriddo: Daily Number Puzzle
★4.8
Sudoku Ultimate Offline puzzle
Sudoku Ultimate Offline puzzle
★4.7
Sudoku Number Place
Sudoku Number Place
★4.3
MultiSudoku: Samurai Sudoku
MultiSudoku: Samurai Sudoku
★4.8
Sudoku Brain Puzzle
Sudoku Brain Puzzle
★4.8
Sudoku Classic
Sudoku Classic
★4.3
Sudoku-Doku
Sudoku-Doku
★4.6
Sudoku Free
Sudoku Free
★4.8
Sudoku Numbers Puzzle
Sudoku Numbers Puzzle
★4.3
Sudoku Master!
Sudoku Master!
★4.7
Sudoku
Sudoku
★4.8
Sudoku - Offline Logic Game
Sudoku - Offline Logic Game
★4.0