Amazon.com: Christian Lacroix Maison De Jeu Two-Sided Puzzle, 2500 Pieces, 20” x 20” – Challenging Puzzle Features Art Depicting the Atmosphere of Vintage French Gambling Houses – Makes a Great Gift :
2,500 year-old Sanskrit grammatical puzzle solved | Popular Science
2500 piece puzzle: MB Grand 1978, #9 Central Idaho. | Flickr