Zol's Suds The number puzzle, played your way.

The rules

If you've played sudoku, you already know it:

• Fill the grid so every row, every column and every box contains each number exactly once.
• Tap a cell and pick a digit; use Notes to pencil in candidates while you reason.
• Clear board wipes your wrong path back to the starting clues in one tap.
• A Hint fills one correct cell and locks it, for a small scoring cost.
• Every board is generated fresh with a single guaranteed solution — you never hit a puzzle that needs a lucky guess.

Pick your size

The difficulty tiers change the grid, from a quick warm-up to a proper sit-with-it solve:

• Easy & Medium — a compact 6×6 grid with digits 1–6 you can clear in a hurry; Medium just hands you fewer clues.
• Hard — the full 9×9, the real thing, and the longest solve in the game.
• Zolified — Hard's 9×9 turned cruel: every 30 seconds the board fills one correct cell for you and locks it, the timer never stops draining, and each forced fill costs more than the last.

It'll finish the grid for you — but the clock and every free cell it hands you are draining your score the whole way. Solve fast, and fight for every point.

Three ways to play

The Daily is one shared board that everyone gets, so you can compare how you did with friends. Free Play deals you unlimited fresh puzzles any time, at whatever size you like. And Versus drops you and a friend onto one identical grid to race. Every solve is scored, with a leaderboard to climb.

Play it

Play Zol's Suds in your browser — nothing to download. Creating an account is free, and new players get a 30-day preview with full access to every game in the catalogue. After the preview, a rotating set of games is free to play each day.

In the mood for more logic? Try Zol's 64, a crown-placement logic puzzle, Zol's Fields, where you divide a grid into numbered rectangles, or Zol's Swords & Shields, a binary-logic grid.