Daily Queens Puzzle — March 1, 2026

Sunday · 15×15 · Toughest · Medium · 19 deductions

15 queens left to place.

Tap once to rule a cell out, twice to place a queen. Right-click marks an exclusion directly. Arrow keys move between cells.

A 15x15 board split into 15 colour regions, needing 15 queens: one per row, one per column, one per region, none touching. Regions run from 1 to 51 cells.

The daily board is the same for everyone and gets harder as the week goes on: Sunday is set to toughest. Every daily puzzle has one solution and needs no guessing.

How this board is solved

Solving this 15x15 board takes 19 deductions and needs the intermediate group-lock techniques, drawing on 7 distinct techniques. The first queen you can place for certain is J1. The queens resolve in the order J1 → E9 → C11 → F7 → G14 → A5 → L6 → H12 → O8 → M2 → N15 → I10 → K3 → D4 → B13. Every step follows by logic, so you never have to guess.

Techniques this board needs

Full solution, step by step (19 deductions)

Single-cell region essential
Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at J1.
Single-cell region essential
Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at E9.
Single-cell region essential
Single-cell region. This colour covers only one cell, so its queen goes there. Place a queen at C11.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at F7.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at G14.
Region line lock essential
Region line lock. This colour must use row 15, so nothing else can. This reasons over row 15. Rules out A15, B15, D15, I15, K15, L15.
Shared diagonal neighbour intermediate
Shared diagonal neighbour. Every remaining option for this colour touches these cells, so they are out. Rules out N2, N3.
Multi-region group lock intermediate
Multi-region group lock. 3 colours fit in only 3 columns, reserving them. This reasons over column 13 and column 15 and column 14. Rules out M3, M4, M5, M6, M8, M12, O4, O5 and 5 more.
Lines use the same regions intermediate
Lines use the same regions. 3 rows can only be filled by 3 colours, using them up. This reasons over row 2 and row 3 and row 4. Rules out B5, D5, H5, I5, K5, L5, D6, H6 and 3 more.
Last cell in a line essential
Last cell in a line. Row 5 has one legal cell left, so its queen goes there. Place a queen at A5. This reasons over row 5.
Last cell in a line essential
Last cell in a line. Row 6 has one legal cell left, so its queen goes there. Place a queen at L6. This reasons over row 6.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at H12.
Last cell in a line essential
Last cell in a line. Row 8 has one legal cell left, so its queen goes there. Place a queen at O8. This reasons over row 8.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at M2.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at N15.
Last cell in a line essential
Last cell in a line. Row 10 has one legal cell left, so its queen goes there. Place a queen at I10. This reasons over row 10.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at K3.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at D4.
Forced queen essential
Forced queen. This colour has one legal cell left, so its queen goes there. Place a queen at B13.

Answer: queens at J1, E9, C11, F7, G14, A5, L6, H12, O8, M2, N15, I10, K3, D4, B13.