Mona Lisa, Educa "Miniature" series, 1000pcs. This is hands down one of the hardest because every piece fits perfectly with every other piece, and since it's tiny, it's hard to discern the
Amazon.com : Eiffel Tower, Paris - 1000pc Miniature Jigsaw Puzzle By Educa : Toys & Games | Eiffel tower puzzle, Eiffel tower, Eiffel
1000, Educa, The Rape of Helena (fragment), (Miniature) - Rare Puzzles
Educa Miniature Sea of Life Jigsaw Puzzle | #252208005
1000 Cans “Miniature” – Educa Borras
Educa puzzle Puzzle World map with 1001hobbies (#-15159)