HINT: If there exists a solution to the puzzle (marked by in a table) it is written in the same color as a background. You have to select text with mouse in order to make it visible.
HINT: By default all puzzles are ordered by descending date (if you don't choose otherwise) according to when they were added to a database (i.e. topmost are newest puzzles). I'll be glad if you help me to expand this collection with new puzzles.