A 50 puzzle demo of the upcoming series of mobile-based puzzle books from Clarity Games.
There are 5 types of game, each with 10 levels:-

• Fiveku (pictured) - 5x5 Sudoku, also called 'Shape Sudoku'.
• Stack - a card game in the FreeCell mould.
• Jump - a frog using teleports?
• Line (pictured) - use the number hints on the side to draw the correct line in the grid
• Pop-7 - Pop any group of two or more jewels. You only get 7 pops to clear the grid.

There are no ads, this is a completely free demo.
The first full commercial volume of puzzle games should be available around July-August 2008, with at least 5 more game types available. Full releases will have hundreds of levels per game.