The ideale alternative to crossword puzzles with textual descriptions! Give students picture clues for the answer and create compelling, diverse educational material :)
To illustrate, I have created a small example puzzle with images. See the screenshot and the link below for the online playable version. Example: Crossword puzzle with images
Currently I have developed a beta-version which only supports landscape images. Ideally, for now, you select pictures that fit the 16:9 proportions so that the images look awesome :).
If you encounter this as a huge obstacle for creating the visual puzzles, please let me know (firstname.lastname@example.org), so that I know there is enough demand for different kinds of orientation :).
This is very simple! Go to this page and select 'Image' instead of 'Normal' and you can immediately start uploading your images as descriptions.
Have lots of fun and please let me know if you walk into any problems or other cool suggestions!