Great Britain

A classic sliding puzzle: fifteen numbered tiles and one blank in a 4×4 frame; slide tiles into the blank until they read 1–15 in order.

Pack six flat pieces of 2 to 7 cubes into a solid 3×3×3 cube; there are about 13 distinct solutions.

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.

Fit irregular, usually interlocking pieces together to rebuild a complete picture and outline.

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 ÷.

A sliding block puzzle on a 4×5 board: shuffle blocks of different sizes to get the 2×2 big block out through the bottom exit. Known in China as Huarong Dao and in Japan as Hakoiri Musume.

A two-player code-breaking game: guess a hidden row of colored pegs; black keys mark right color and place, white keys mark right color wrong place.

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 one-player pegboard puzzle: jump a peg horizontally or vertically over a neighbor into an empty hole and remove the jumped peg, usually until only one peg remains.

A cube-shaped twisty puzzle that turns about its corners, moving half the cube at a time, until all six faces are solid colors.

A logic puzzle: fill a 9×9 grid so every row, column, and 3×3 box contains the digits 1–9 exactly once.

A Chinese seven-piece dissection puzzle in which all pieces are rearranged without overlap to reproduce a silhouette.