How to Play
One worked example, from empty grid to solved board.
1. The grid and its targets
The board is 6×6. Every column carries a target sum above it and every row carries one to its left. Twelve targets in all, and a solved board hits every one of them.
The 36 numbers that fill this grid add up to 115 — and so do the six row targets, and so do the six column targets. Every number you place is counted twice: once by its row, once by its column.
2. The pieces
The numbers do not arrive one at a time. They come welded into pieces — connected blocks of four to six cells, each cell carrying its own number. This puzzle has seven of them, and together they cover the grid exactly: no gaps, no overlaps, nothing left over.
You cannot break a piece apart, and you cannot leave one in the tray. Both facts are what make the puzzle solvable: with 36 loose numbers there would be countless answers, but with these seven shapes there is exactly one.
3. Placing and rotating
Tap a piece in the tray to pick it up, then tap a grid cell to drop it. Tap a piece already on the board to lift it back off.
Right-click or double-tap a piece to turn it a quarter clockwise. The numbers travel with their cells — rotating changes where a number can go, never what it is worth.
4. Reading a sum
Each target is colored by the numbers currently sitting in its line. Here is one row of the example — target 16 — read three different ways.
Correct
The numbers add up to exactly 16, so the target turns green. Green is the goal for all twelve lines at once.
Incorrect
The purple piece pushes the row to 19, three past the target. Red means something in this line has to move.
Incomplete
Eleven so far, with three cells still empty. Dim is not a mistake; it just means the row is unfinished.
Dim is the normal state of an unfinished line, so it is red you watch for: red says the numbers already in that line have overshot, and one of them belongs somewhere else.
5. Mid-solve
Three pieces down, four to go. The bottom row is already complete and green; every other line is still short, and shows it.
A target going green is not a promise that the pieces under it are right — only that the line adds up so far. Two green lines can still be crossed by a red one.
6. Solved
All seven pieces placed, all twelve targets green. That is the whole win condition — there is no separate check to run and nothing to submit.
A new puzzle arrives every day, and everyone plays the same one. Difficulty climbs through the week: Monday is the gentlest, Sunday the hardest.