Domino Fit

Domino Fit is a daily logic puzzle built around dominoes and their dots. Each board comes with a target number printed beside every row and column, and your job is to drop dominoes onto the grid until the dots in each line add up to exactly the number that line calls for. Each puzzle has one solution, so it rewards careful deduction rather than guessing.

What is Domino Fit?

You fill a grid, offered in 6x6, 7x7, and 8x8 sizes, with dominoes. You do not get a full set of tiles to place freely. You choose between two fixed dominoes: a vertical piece worth one dot on one half and zero on the other, and a horizontal piece worth zero and two. You cannot rotate them beyond that, and the FAQ says plainly that this is part of what makes the game hard. As you place tiles, the clue numbers beside each row and column change color to show your progress. Black means the line is still under its target, green means it matches exactly, and red means you have gone over. The board is solved when every number sits at green.

What sets Domino Fit apart from most games in the -dle family is that there is no word, no trivia answer, and no daily secret to reveal. This is a spatial deduction puzzle closer in spirit to sudoku or kakuro than to Wordle. The creator has described it as being like sudoku but with a geometric angle, since the sum of the dots must match the row and column numbers. It is also worth separating from the many mobile arcade apps that share the name Domino Fit and revolve around dropping blocks for score. This one is a constraint puzzle with a single answer per board, not a score chase.

The game was made by a developer who goes by macromaniac, and it was announced through a Show HN post on February 18, 2024. It was built with TypeScript and runs on the creator's own home server, which they refer to as Betsy, the server under the couch. Alongside the free browser version there is a separate paid release on Steam that costs 99 cents. The browser game tracks a current and best streak and flags a clean solve with no mistakes as wizardry, which gives regular players something to aim for beyond simply finishing.

When you complete a puzzle you get a copy button on the results screen so you can share your outcome. Display and comfort options are reasonable for a small daily puzzle. There is a dark mode, a colorblind mode, a sound toggle bound to the m hotkey, and an optional readout of your solve time. Feedback to the creator goes through email rather than an in-app form. The overall feel is quiet and self-contained, a short daily thinking exercise rather than a game built to hold your attention for hours.

How to play Domino Fit

1. Open Domino Fit at dominofit.isotropic.us and pick a grid size: 6x6, 7x7, or 8x8.
2. Read the target number printed beside each row and each column; that is the dot total that line must reach.
3. Choose a domino, the vertical one/zero piece or the horizontal zero/two piece, and place it on the grid.
4. On desktop click to place a domino and right-click to swap its orientation; on mobile tap to place.
5. Watch the clue colors: black means the line is still under target, green means it is exact, red means it is over.
6. Keep placing and adjusting until every row and column number shows green, which means the board is solved.

Tips and strategy

• Start with the rows or columns that have the lowest target numbers, since they constrain placement the most and rule out options fast.
• Use the color feedback as a live check: a red line tells you to pull a tile back before you commit elsewhere.
• Remember you only have two tile shapes with fixed dot values, so plan around the one/zero and zero/two options rather than expecting flexibility.
• Look for cells forced by both a row and a column target at once; those intersections are often where the single solution locks in.
• Aim for a clean run with no mistakes, since a perfect solve is flagged as wizardry and is a good measure of your deduction rather than trial and error.
• Turn on colorblind mode if the green, red, and black clue colors are hard to tell apart, so you never misread your progress.

Good to know

Category

Logic puzzle

Resets

New puzzle daily

Cost

Free in browser; 99-cent Steam version

Guesses

No guess limit; single-solution deduction

Modes

6x6, 7x7, and 8x8 grids; dark mode, colorblind mode, sound toggle, solve-time display

Creator

macromaniac

Launched

2024 (Show HN, February 18, 2024)

Platform

Browser and Steam

Domino Fit FAQ

Is Domino Fit free?

Yes, the browser version at dominofit.isotropic.us is free to play. There is also a separate paid version on Steam that costs 99 cents.

How do you play Domino Fit?

You place dominoes on a grid so the dots in each row and column add up to the target number printed beside that line. Numbers show black when under target, green when exact, and red when over. The board is solved when every number is green.

When does Domino Fit reset?

A new puzzle drops daily. The site advertises new puzzles daily, though it does not state an exact reset time or timezone.

Is Domino Fit like Wordle?

Not really. It shares the daily-puzzle and share-your-result format, but instead of guessing a word it is a spatial logic puzzle closer to sudoku or kakuro, where you satisfy row and column dot totals with a single solution.

Who made Domino Fit?

It was made by a developer who goes by macromaniac, built with TypeScript and announced through a Show HN post in February 2024. It runs on the creator's own home server.