100 years ago today, the first crossword puzzle was published, according to Smithsonian (1). In Ukraine Serhiy Petyuk decorated a house with a crossword puzzle, where you can see the letters only at the night (2). Ken Knowlton and Frank Longo made the portrait crossword (3). Christian Svanes Kolding made the QR-crossword (4).
thx 2 nerdcore for the head’s up