Einstein puzzle is a free cross-platform open source remake of old DOS game Sherlock, which development was inspired by Albert Einstein's puzzle. Einstein said that only those with an intelligence quotient of 98 percentile and higher should be able to solve it.
No cons, maybe there should be more colour or symbols sets
Summary
Still pales to Sherlock
24RamseyBoy
Pros
Large enough to fill screen
Cons
Sherlock has more tile sets available.
The hints don't always work accurately.
The color themes lack contrast.
Summary
While this is a stab at something newer than the DOS version of Sherlock, it isn't anywhere near as feature packed as the Windows-based versions of Sherlock.
All time favorite solo brain exercise game.
tufofi
Pros
A tranquil solitaire style game that pushes you sudoku-like muscles and keeps your brain sharp,
Cons
simple game with few settings or options to enhance the user experience. no simple way to share or compete with friends on the same puzzles.