Here is Apple's free app of the week, Noodles!
The addictive game includes thousands of puzzles that you can play immediately without having to unlock anything on the screen. And there are no extra gold coins to buy, or other in-app purchases to make.
The developer says that the game scores 4.5 stars in every country. You can find out why without putting down one red cent. Simply click on the sourcelink and install the game.