Ever try Sokoban puzzles?
http://www.letslogic.com/
An alternative to Sudoku is Str8ts
http://www.str8ts.com/
How about a little sugar sugar?
http://www.addictinggames.com/puzzle...sugar-game.jsp
Some levels of this game are pretty tough, most are not too hard.
http://hoodamath.com/games/woodenpath2.php