35 levs in a fun online banknotes puzzle.

The "Bulgarian Lev Puzzle" is a free online knowledge level game, about the outlook of the Bulgarian Lev banknotes, including one 5, 10 and 20 lev bills.
It is a small square rotating puzzle for desktop computers, laptops and tablets, which may be played in the web browser. Align the squares to fit the lev banknotes picture.
The Economics Knowledge Board include 40 picture pieces of the lev to sort out.
Part of the Interactive Personal Finances educational tools.

This fun education game may answer some of the following questions:

1. How does 5 levs back and front banknote looks like?
2. How does 10 levs back and front banknote looks like?
3. How does 20 levs back and front banknote looks like?