Pencil Logic Puzzle

A Nikoli logic puzzle: place bulbs so every white cell is lit, no bulbs shine on each other, and numbered walls have the required adjacent bulbs.

Place the whole fleet so each row and column holds the number of ship cells shown; ships may not touch, even diagonally.

A two-symbol puzzle: on an even-sized grid, place 0s and 1s so each row and column has equal counts of each, no three identical symbols run consecutively, and no two rows or columns are identical.

Fill every cell with a number so each region of equal numbers has exactly that many cells; regions of the same size may not touch.

An inequality puzzle: fill an n×n grid with 1–n so no digit repeats in any row or column, and every > or < sign between neighbors holds.

A bridge puzzle: connect numbered islands with horizontal or vertical bridges so each island has as many bridges as its number. Two islands share at most two bridges, bridges never cross, and all islands must link up.

A room-shading puzzle: shade cells in bold rooms so each number matches its room’s shaded count. Shaded cells can’t touch side by side, white cells stay connected, and a straight line of white cells spans at most two rooms.

Fill the grid with consecutive numbers so each number touches the next one horizontally, vertically, or diagonally.

Shade some cells of a filled number grid so no number repeats in any row or column; shaded cells can’t touch, and unshaded cells must stay connected.

Shade cells so the column numbers of shaded cells in each row, and the row numbers in each column, add up to the given clues.

A logic puzzle: fill white cells with digits 1–9 so each crossword-like run matches its clue sum and contains no repeated digit.

An arithmetic puzzle: fill an n×n grid with 1–n so no digit repeats in any row or column, and the numbers in each thick cage reach its target with the given +, −, ×, or ÷.

Shade cells so each number equals the white cells it can see in four directions, itself included; shaded cells can’t touch, and whites stay connected.

Shade an L, I, T or S shape of four cells in each room so all shaded cells connect, no 2×2 is shaded, and identical shapes never touch.

A pearl loop puzzle: draw one simple loop through cell centers that visits every white and black circle, obeying straight/turn rules that differ by color.

A picture logic puzzle: paint cells filled or blank so every row and column's contiguous blocks match the edge run-length clues—often revealing a hidden image.

Connect each pair of matching numbers with a path; paths can’t cross, branch, or pass through other numbers.

A shading logic puzzle: form numbered white islands of exact size while painting one connected black wall with no 2×2 black pools.