If you like crosswords but would rather work with numbers, Kakuro fits right in. Each run of squares adds up to the clue at its end, and no digit repeats inside a run, so filling the grid is part arithmetic, part deduction.
Every Kakuro board is built on your phone, and each has a single fill you can deduce without ever guessing. When a long run has you stuck, the built-in combination helper shows which digits can legally fit, the same trick regular solvers keep on a cheat sheet. Pencil marks let you jot candidates before you commit.
• Four sizes from a gentle 6x6 up to a 9x9 that will keep you busy
• A check button that flags a wrong entry before it spreads
• A new puzzle every day, then as many more as you want
No sign-up and no connection needed, so a waiting room or a long flight is plenty. The numbers stay large and clear even on a small screen.
Made for number-puzzle people who've done their share of Sudoku and want sums instead of singles.