Pure Kakuro: Cross Sums

Kakuro is a crossword with digits instead of letters and sums instead of clues. Every chain of squares has a given sum. Fill in digits so they add up to it. Digits run from 1 to 9 only, and no digit repeats inside one chain. There are no other rules. Nothing is guessed and nothing is brute-forced: every puzzle has exactly one solution, and reasoning always gets you there. What's inside Four difficulty levels: Easy, Medium, Hard and Expert. Every puzzle is verified by a solver — a solution exists, and there is only one. A Daily puzzle. One a day, the same one for everyone. Solve them back to back and a streak builds up. Checking, your way. Have the game only tell you a mistake is there — or have it show you where. A timer and statistics: time on each puzzle, puzzles solved, best and average time per level. The timer can be hidden. Autosave. Leave in the middle and you come back to the same place, with the same digits and the same time. Rules with worked examples inside the app, for anyone opening Kakuro for the first time. Light and dark themes. No sign-up No account, no email. The app asks for no access to your files, contacts or camera. Interface language: English, Russian, Spanish, French, German or Portuguese, switchable in Settings regardless of the system language. Kakuro is a quiet game. Nothing here rushes you, no lives run out, nothing has to be collected. There is a grid, there are sums, and there is the reasoning that leads to the one answer.