Doppit

What Doppit is

Doppit is a daily puzzle almanac. It gathers 25 hand-built logic puzzles under one roof — old friends like the nonogram, star battle, futoshiki and akari, alongside originals you won't find elsewhere. Each one deals a fresh board every day, in three difficulties, and the whole thing is free to play in your browser at doppitgame.com.

It started as a single domino puzzle. That game is still here — it's Dominit, No. 04 in the almanac — but Doppit grew into a shelf of them. One tab, twenty-five puzzles, a new set every morning.

How a day works

There are no accounts and nothing to install. Open the almanac, pick a puzzle, pick a difficulty, and solve. Easy is a thirty-second warm-up. Medium asks for a few minutes of chained deductions. Hard is proper craft — several minutes of clues that argue among themselves. Every board is solver-checked before it's dealt, so each one has exactly one answer waiting to be found.

Undo, hints, a reset, a pause and a timer are all there if you want them, plus optional stats, achievements and light or dark themes. None of it is required — you can just play.

The almanac — 25 puzzles

Every puzzle in Doppit, and the classic it grows from:

1. Aquait · Aquarium — fill tanks to match the water counts.
2. Campit · Tents and Trees — pitch a tent beside every tree.
3. Copyit · Deduction — unmask each copyist's secret tic.
4. Dominit · Domino logic — fit every domino to the region rules.
5. Duoit · Binary logic — equal suns and moons, no three alike.
6. Fellit · Chain reaction — one push fells the whole forest.
7. Groveit · Fillomino — grow number groves of matching size.
8. Hoistit · Counterweights — one car rises, another must fall.
9. Islandit · Nurikabe — flood one sea around numbered islands.
10. Lightit · Akari — place bulbs to light every square.
11. Nonit · Nonogram — paint blocks to match the number clues.
12. Pipeit · Pipe loops — rotate pipes into one closed loop.
13. Plotit · Number sums — fill plots to sum to their numbers.
14. Rankit · Futoshiki — 1 to N in each line, beaks point bigger.
15. Sandit · Suguru — regions hold 1 to N, equals never touch.
16. Skyit · Skyscrapers — place towers to match the edge views.
17. Snipit · Vine cutting — snip the vine, spare the fruit.
18. Springit · Spring placement — place springs so water soaks everything.
19. Spyit · Deduction — deduce each agent, loyal or traitor.
20. Stellit · Star Battle — stars in every row, column and region.
21. Summit · Calcudoku — fill 1 to N so every cage hits its number.
22. Tiltit · Sliding logic — tilt the tray till every letter seats.
23. Trackit · Train Tracks — lay a single track to match the counts.
24. Yinit · Yin-Yang — two connected seas, no 2×2 blocks.
25. Wellit · Distance logic — dig wells at each crop's exact distance.

Dominit, the puzzle it grew from

The house domino game is still the heart of the collection. Its board is a connected grid partitioned into shaded regions, each carrying a numeric constraint. A 5 means the region's cells must sum to 5. An = means every cell must be equal, a ≠ means all different. <5 caps the sum below five; >5 demands more; a blank region accepts anything. You drag dominoes from the tray onto the grid until every region is satisfied — a tile can lie across a border, and a one-square region takes half a tile.

Where the name comes from

Every puzzle wears an -it suffix — Nonit, Skyit, Trackit — so the almanac that holds them is Doppit. The style is "The Domino Almanac": letterpress buttons, paper grain with a vignette, tracked-caps eyebrows and pip-dot ornaments. The idea was a Sunday-newspaper puzzle page that happens to live on the web — and now it runs a new edition every day.

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