What Is the Daily Geography Game Flagdoku and How Do You Play It?

Flagdoku is a daily geography puzzle game in which you place 9 flags into a grid so that each flag satisfies both the criteria of its row and its column. It plays like a flag-themed sudoku: instead of numbers, you're matching countries to two overlapping clues at once. You can play today's puzzle or open past ones from the archive, and the maximum score for a round is 9 points.

The Core Goal: 9 Flags, Two Criteria Each

The grid has rows and columns, and every cell sits at the intersection of one row criterion and one column criterion. To fill a cell correctly, the flag you choose must meet both conditions at the same time.

For example, if a row is defined by one attribute (such as a region or a design feature) and a column by another, the correct flag is the one that belongs to both groups — not just one. A flag that fits the row but not the column is still wrong.

Your task is to guess the 9 flags that complete the whole grid.

How a Round Works

1. Read the row and column criteria. Each row and each column carries its own condition. Together they define what belongs in every cell.
2. Guess a flag for a cell. Enter the flag you think satisfies both the row and the column for that position.
3. Check the result. A correct guess fills the cell and earns a point. A wrong guess earns nothing.
4. Repeat until the grid is full or you stop. The maximum score is 9, one point per correctly placed flag.

Scoring at a Glance

Wrong answers don't cost you points — they simply don't add any. That means guessing is low-risk, but careless guesses won't move your score.

The Flag of the Day

Each puzzle includes a special flag of the day — a flag that fits into all categories in the grid. Finding it is part of the challenge, and it can serve as an anchor: once you identify a flag that satisfies every criterion, you can use it to reason about the rest of the grid.

Daily Puzzles and the Archive

A new Flagdoku becomes available each day, so there's a fresh grid to solve on a daily basis. If you miss a day or want to practice, you can play previous games:

• Open the Archive to browse past puzzles.
• Click a #Number cell to load a specific earlier game.

This makes Flagdoku replayable rather than a one-shot daily — useful if you want more practice with the row-and-column logic.

A Basic Strategy for Narrowing Flags

Because every cell needs a flag that satisfies two conditions, the fastest approach is to work from the intersection outward:

• Start with the most restrictive cell. Find the row and column whose criteria overlap the least — the cell where the fewest flags could possibly qualify. Solving that first removes options elsewhere.
• Combine clues, don't treat them separately. List flags matching the row, list flags matching the column, then keep only the ones on both lists. The answer is in the overlap.
• Use the flag of the day as an anchor. Since it fits all categories, it can confirm or eliminate candidates across the grid.
• Fill confident cells first. Each solved cell narrows the remaining possibilities, so lock in the ones you're sure of before guessing.
• Guess when stuck. Wrong answers cost no points, so a reasoned guess is better than leaving a cell empty.

Who It's For

Flagdoku suits anyone who enjoys daily puzzle games and wants to test or build their knowledge of world flags. It rewards familiarity with flags and their attributes, but the sudoku-style structure means logic and elimination matter as much as memorization. If you like the idea of a short daily geography challenge with an archive to fall back on, it's a straightforward fit.