CloneRNX is a simple puzzle game.
Dominoes on Acid
Superficially, Dominoes on Acid is a solitaire variant of Dominoes with weird colorful tiles. But on a deeper level it is a GUI for natural deduction. Every completed domino is equivalent to a proof of a tautology in classical propositional logic.
LetterMeister is an addictive word puzzle game originally released for iPhone/iPad.
Peces is a program to play the traditional Tangram, a game of Chinese origin.
Sudokuki is a graphical Sudoku game. It solves even the most difficult sudoku grids for you. It can generate a sudoku, play sudoku, and print a sudoku.