Hyper Sudoku for beginners

This article assumes you've played classic Sudoku before, even casually, and you're now looking at your first Hyper Sudoku — also called Windoku — and wondering what you're meant to do differently. The short answer is: not much. The slightly longer answer is below.

Before you start

Open an easy Hyper Sudoku puzzle in another tab. Look at the board. Notice the four 3×3 regions outlined in soft coral — those are the hyper regions, the structural addition that makes the variant what it is. There are four of them, positioned in the middle of each quadrant of the board, not touching each other and not touching the edges of the grid.

Cells inside the hyper regions follow one extra rule on top of the usual Sudoku constraints: each hyper region has to contain every digit from 1 to 9 exactly once, just like a row or a column or a 3×3 box. Cells outside the hyper regions play exactly like classic Sudoku.

That's everything you need to start.

The first move

Pick a digit and scan the board for it the way you would in classic Sudoku. Look in each row, column, and standard 3×3 box for cells where the digit has only one valid placement. Place the easy ones first.

When you place a digit inside a hyper region, the hyper region now contains that digit, which eliminates it from the other eight cells of the region. This is the only new thing to track. Every classic move you already know works the same way — naked singles, hidden singles, scanning, pencil marks, all of it — but the hyper regions give those moves a fourth unit to fire on for the cells that sit inside one.

When the hyper regions become useful

Most of an easy Hyper Sudoku solves by classic-style scanning alone. The hyper regions just give you a few more places to spot naked and hidden singles. Don't overthink the regions on your first puzzle; play it as you would a classic and notice where the regions happen to help.

By the middle of the puzzle, you may hit a cell where row, column, and box reasoning haven't narrowed the candidates down to one. Before reaching for a more complex technique, ask: does this cell sit inside a hyper region? If yes, what digits are already in that region? Eliminate them from your candidate list. About half the time, that's the missing constraint.

A common beginner mistake

The most common stumble on a first Hyper Sudoku is forgetting the hyper regions exist. The mistake usually goes like this: you scan a row, scan a column, scan a box, find no candidates that are forced, and assume the puzzle requires a more advanced technique. Then you consider pairs and locked candidates for a few minutes, eventually place the digit somewhere, and look up to realise the hyper region already contained that digit two cells over — it had been impossible all along.

The fix is mechanical: when you're working on a cell that sits inside one of the four hyper regions, the hyper region joins the list of units to scan, the same as the row, the column, and the box. After your third or fourth puzzle, this becomes automatic.

The hyper regions are visually outlined on the board, which speeds the habit considerably. You don't have to remember their positions cold; the geometry is visible at all times.

What "done" looks like

A solved easy Hyper Sudoku has every row, column, standard 3×3 box, and every hyper region containing each digit 1 through 9 exactly once. The completion overlay triggers when the grid is logically complete — you won't accidentally submit a wrong puzzle.

If you finish your first one in fifteen minutes, that's normal. If it takes twenty-five, also normal — the four-unit scan is a new habit, and habits are slow before they're fast.

When you're ready for medium

After three or four easy Hyper Sudoku puzzles, you'll notice the four-unit scan has become automatic. Your eye starts to include the hyper regions without your conscious effort. That's the moment to try medium. The mediums have fewer givens to start with and lean more heavily on the hyper regions, which is where the variant actually starts to feel distinct from classic.

If you'd like a deeper look at the moves the hyper regions make possible, when hyper regions narrow it down walks through the three patterns most worth recognising. Or just play the next puzzle. The regions teach themselves.