Popular Games

OkuDoku — complete the 1-2-3-4 set to clear the board

OkuDoku is a number-placement puzzle in LEVO's Popular Games category, played on a 6×6 board. You drag small figures whose cells carry the numbers 1 to 4 onto the board; whenever four cells in a row, in a column, or in a 2×2 square hold the complete set 1-2-3-4, they clear and score. It plays like a block puzzle where the numbers, not just the shapes, decide what clears — a distinct sudoku-flavored twist. OkuDoku has 100 levels and helps improve spatial reasoning, mental arithmetic, and decision making.

Start training Questions & answers

CategoryPopular Games

Levels100 levels

TimedNo — untimed

ProgressionLevel-based

How to play

The 6×6 board starts with a few numbered cells in place; a tray below offers three small figures — single cells, dominoes, and diagonal pairs — each cell carrying a number from 1 to 4. Drag a figure onto empty cells; a preview shows where it lands and highlights any completions it would create. Clears happen wherever four cells form the full 1-2-3-4 set in one of three shapes: four in a row, four in a column, or a 2×2 square. Placing cells scores, cleared cells score more, and completing two or more sets with a single drop doubles the clearing bonus. Used figures are replaced once all three are placed. Reach the level's score target to win; the level fails when none of your three figures fits.

What it helps improve

Spatial reasoning — You are fitting shapes and projecting which of three completion patterns they will trigger, strengthening how you visualize and manipulate objects in space.
Mental arithmetic — Every placement is a running tally of which numbers each row, column, and square still needs — improving quick calculation in your head.
Decision making — Board space is the resource; each drop either opens the board or clogs it, sharpening faster and more effective choices under pressure.

Levels & progression

100 levels, played in order, with the level rail on the pre-game screen. Untimed, no lives — win at the score target, lose when nothing fits. A three-step guided tutorial demonstrates line, square, and double completions.

Questions & answers

How is OkuDoku different from sudoku?

Sudoku is a fixed logic grid you fill in; OkuDoku is a placement game. You drag figures carrying the numbers 1–4 onto a 6×6 board, and any row of four, column of four, or 2×2 square holding the complete 1-2-3-4 set clears for points.

What clears cells in OkuDoku?

Three patterns: four consecutive cells in a row, four in a column, or a 2×2 square — whenever the four cells hold 1, 2, 3, and 4 with no repeats. Completing more than one pattern with a single drop doubles the bonus.

How does an OkuDoku level end?

You win by reaching the level score target and lose when none of the three offered figures fits on the board. There is no timer — OkuDoku is about board management, not speed.