Rail Maze is a classic puzzle game that keeps you thinking. You have to twist and turn tracks for a railroad train to get it to its destination while avoiding obstacles.

Bakery Story is a free game available on the Kindle Fire and many other platforms. In this fun, relaxing game, you manage a bakery shop, feeding customers and decorating your little store.

NinJump is an easy to understand, fun to play scrolling arcade style game. In this case the direction you're scrolling is UP, as you move ever higher between a pair of skyscraper buildings.

Cut the Rope is an amazingly fun puzzle game for the Kindle Fire. Rather than blocks or bubbles, here you get physics puzzles with swinging candies on ropes.

Quell is a game app for the Kindle Fire and other platforms. It's a zen-like puzzle game with delightful music and gameplay which is both soothing and challenging. Highly recommended!

Most people think of the Amazon Kindle Fire as an ebook reader. Sure, it does that, but it also plays games from the Droid gaming library. The large screen is a plus over smartphones!