FadiDev
Sum Grid
Killer Sudoku without the guess
Every puzzle in Sum Grid is proved to have exactly one solution and is solved end to end by the same logic engine that powers the hint button, before you ever see it. Classic Killer Sudoku from Beginner 6×6 to Expert 9×9, three ways to play, and the puzzles need no connection.
iOSfreeplays offline8 languages
What it does
Never guess — every board has exactly one solution and can be finished by logic alone
Hints that explain — the next step names the technique, marks the cells and says why
Combination helper — select a cage and see every digit set for its size and sum
Cages you can read — soft tinted trays with the sum on a tab, or classic newspaper lines
Journey — climb ten monuments to the Summit, one block for every solved level
Classic and Daily — Beginner 6×6, then 9×9 from Easy to Expert; the puzzles never run out
A techniques school, from unique combinations and the 45 rule to What if
Game Center leaderboards and achievements, best times for every size
Free, funded by an ad after a puzzle — never during one; one purchase removes them
8 languages supported