Futoshiki, More or Less logic puzzles for primary and secondary math learners
Futoshiki - Wikipedia
Futoshiki Puzzles Brain Game: The perfect mix grid easy 4x4 puzzles challenging logic number comparison sudoku you entertained for weeks. After solving all the puzzle this book (Series 20): Elizatriya, Tiyada: 9798621999155:
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Futoshiki - Wikiwand
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Easy Futoshiki 4x4 Puzzles - How to Solve - YouTube
Futoshiki - online puzzelspel
Calcudoku puzzle forum - View topic - Futoshiki samples