Difficulty that means something
Puzzles are graded by the hardest technique needed to solve them, not by how many clues were removed. An Expert grid is one that genuinely asks for an expert's move.
Grid logic puzzles
Delzo Games
For iPhone and Android. No coins, no energy, no pay to win.
Out now
Sudoku – Classic & Variants. Classic, Killer, Jigsaw, Sudoku X and Thermo, with a daily challenge that changes variant every day.
What makes it different
Hints that teach
A hint names the technique and explains why it applies to the grid in front of you, then lets you place the digit yourself. You finish knowing what to look for next time.
Nothing to grind
No coins, no energy meters, no timers between puzzles. One optional purchase removes the adverts, and that is the whole shop.