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Climb Sudoku turns Sudoku into a race against the clock. Instead of one big grid you face an endless tower of 3x3 boxes, and every box you solve lifts you one step higher. It is free to play in your browser, with no sign-up.
Three boxes are active at a time, stacked as a single Sudoku column, with a faint preview of the next one falling in above them. You solve the bottom box to climb. The boxes above it reveal helper neighbours that give you extra clues, and if you have already solved a box higher up, clearing the bottom one moves several boxes up at once - extra height in a single move.
You have three lives. You lose one for a wrong digit, or when the countdown for the current square runs out. The timer starts at 45 seconds and gets shorter the higher you climb, down to a floor of 15 seconds, so the same kind of box feels harder every few steps. Working ahead is rewarded: clearing two boxes in one move adds 5 seconds to your timer and clearing three adds 10.
If you already enjoy Sudoku and want something quicker and more tense, this is a good next step. Every run is short, the rules fit in a minute, and the question is always the same: how high can you get before the tube drains? Your height is your score, and you can aim to beat your own best or the leaderboard. The Climb Sudoku strategy guide has the exact timer numbers and a way to climb higher.
Play as a guest, or create a free account and verify your email to record your best heights on the leaderboard for this week and for all time.
Prefer to take your time? Play classic Sudoku online with five difficulty levels, or solve an online jigsaw puzzle with friends.
Climb an endless tower of 3x3 boxes. Three are active at once, stacked as one sudoku column - solve the bottom one to climb higher.
Dimmed boxes are "helpers" - read-only neighbors that give you extra row clues but can't be edited themselves.
Goal — solve position 1 and everything shifts up one slot. Get position 2 and/or 3 solved early and clearing position 1 shifts all of them up at once, for extra height in one move.
Lives — you have 3. Lose one for a wrong digit, or for running out of time on the current square.
The timer — the tube beside the board drains as your time for the current square runs out. It shortens as you climb higher, down to a 15-second floor.
Bonus time — clear 2 boxes in one move for +5 seconds, or all 3 for +10 - added on top of your timer for good, until the next scheduled drop.