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:
Easy Futoshiki 4x4 Puzzles - How to Solve - YouTube
Amazon | Futoshiki Puzzle Book For Adults: 150+ Puzzles Vol 22 - Inequality Puzzles For Adults, Seniors and Elderly With a Mix of Additional Teasers Such as Marupeke, Sikaku, Tents and Fill-In
Amazon | Futoshiki Puzzle Book for Adults: 252 Japanese Math Logic Puzzles | Easy to Hard | Rankin, E. "Brainbox" | Puzzles