What is Sections Puzzle?

Sections is a number logic puzzle where thick lines divide a grid into straight horizontal or vertical runs of cells. Each section must contain the numbers 1 through its own length exactly once. The core mechanic is that every cell belongs to two sections simultaneously—one across and one down—so each number must satisfy both constraints.

How to play Sections Puzzle

  1. Identify the sections by reading the thick boundary lines on the grid.
  2. Tap a cell to select it.
  3. Enter a digit from the keypad. The keypad range matches the longest section on the board, running 1 to 4 on a four-by-four grid.
  4. Use Notes to pencil in candidate numbers, Undo to reverse a move, Erase to clear a cell, and Restart to reset the entire grid.
  5. Watch the mistake counter in the header, which allows up to three errors before the puzzle ends.

Why the section design works

Sections are one-dimensional constraints. A three-cell run is a small, self-contained unit you can often solve immediately. The grid is built from these crossing runs, so progress comes through quick certainties rather than multi-step chains. This structure keeps the rules simple while letting difficulty rise through geometric complexity instead of additional clauses.

Reading the feedback

The game grades each placement as you enter it. A MISTAKES counter in the header starts at 0 of 3 and increments when you place a number that violates a section rule. The board itself shows only selection highlighting and the section boundaries, so the counter is your primary indicator of correctness.

Modes

The welcome page offers five exclusive puzzles ranked from Beginner to Expert. These appear as numbered rungs (1 through 5) along the bottom of the screen, allowing you to choose your difficulty level for each session.

Tips for solving efficiently

  • Solve at the intersections, not within a single section. A number valid in its horizontal run may still break the rule in its vertical run, and every deduction depends on checking both.
  • The longest section on the board determines the highest digit you will use. A four-by-four grid needs only digits 1 through 4.
  • Short sections often yield immediate placements. A two-cell run must hold 1 and 2, so if one direction already contains a 1, the crossing cell is forced.

Popular question

Why does the keypad stop at 4?
A section holds the numbers 1 up to its own length. The longest run on a four-by-four board is four cells, so no digit higher than 4 ever appears.