The Da Vinci Cryptex

A pure puzzle game with no relation to the House of Da Vinci titles. This plays like a puzzle book, with 50 pages that must be translated into 5 letters and entered into the Codex to proceed. Puzzles range from very simple to a few that are fairly obscure. There is a hint button if you are truly stuck. It is designed for a touch screen but plays fine with a mouse.

It is a relaxing exercise to tickle your brain without any distractions from story, dialog, or scenery.

50 levels.. around 25 unique levels - rest is repetitions.
20 of these levels are cool, the others didn't make much sense imo (solution-wise).

All in all I played the whole game in 2 hrs and had fun for 75% of that time.
But that's not worth 4€.

There are many easy puzzles, a few that make you think, a dash of brain ticklers, and a handful that make no sense. If you are easily frustrated over games that have answers that are wrong, arbitrary, or force assumptions, don't play.