Sudoku AI Duel - Number Puzzle

A sudoku you split with an AI. You take turns claiming cells. Fill one cell and the AI fills one. A number that is not the answer is refused and costs you the turn. When the board is full, whoever holds more cells wins. The colours on the board are the scoreboard. ◆ An AI that shows its work Every move the AI makes comes with its reasoning: the cell, the number, and the name of the technique, like "2 is the only candidate left in row 5". When techniques run out it guesses, and a wrong guess leaves a mark on the board. You can see what your opponent is looking at. Four opponents. The beginner scans one unit per turn and misses now and then. The demon scans the whole board, rarely errs, and sees one advanced pattern per game. ◆ Learn one technique at a time Ten techniques in ladder order, from naked singles to XY-wings. Each lesson hands you a board where that technique is actually needed and lets you find it first. If you get stuck, the explanation walks you through in three steps: where to look, what is blocking, and what follows. ◆ Solo Four difficulties. They are graded by the techniques a puzzle requires, not by how many cells were removed. Easy needs only a glance at a single cell; Expert has several places that only open with advanced patterns. Hints do not fill the answer in. They explain first, and fill on the last step. ◆ Smart lines Scan a number and lines are drawn across every row and column that already holds it, the way you would draw them on paper. The empty cells the lines miss are where that number can still go. ◆ Also Every puzzle has exactly one solution, verified by counting to a second one while it is generated. Your game saves itself. Close the app and it picks up where you left off. Pencil marks are free. Even in a duel, notes never cost a turn. No internet needed and no account. Puzzle generation and the AI both run on your device.