- Chess problem
- Chess puzzle
- Eight queens puzzle
- KenKen
- Mahjong solitaire
- Peg solitaire
- Pentomino
- Prisoners and hats puzzle
- Rubik's Cube
- Tangram
- Three cups problem
- Tiling puzzle
- Tsumego
- Tsumeshogi
The "Egg of Columbus" tangram puzzle, with construction lines shownThe Egg of Columbus (Ei des Columbus in German) is a puzzle consisting of a flat egg-like shape divided into 9 pieces by straight cuts. The goal of the puzzle is to rearrange the pieces so as to form other specific shapes, as in a tangram.
The earliest known examples were produced by Richter, a German toy manufacturer. Production ceased in 1963, but restarted near the start of the 21st century.