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Trainyard for iPhone combines simplistic graphics and design with puzzles that are not so simple. The concept of the game is to get all the trains into the correct stations without a collision. The first several levels will teach you the basics but after that, you'll definitely be scratching your head.

[iTunes Link]

After learning a couple basics, you'll quickly be sending trains into the correct stations. Then you'll gradually learn more maneuvers and techniques as the courses get more difficult. One thing I really liked about Trainyard is the progression. You don't feel bored but the levels don't overwhelm you either. Before each new trick or maneuver, you'll spend several levels getting to know techniques before adding another.

You'll need to learn techniques such as crossing tracks and merging trains. In some stations, you'll have two trains and a hub that's a different color. For instance, if you have a station that will only accept a green train, you'll need to combine a blue train with a yellow in order to make one green train. The game will only use primary color trains and if you make a bad mix, you'll get an ugly brown train, which no station will accept.

As you get further into the game, you'll have to combine several techniques to get the correct patterns. There isn't only one right solution to many levels though. While you may solve a level one way, another user may solve it another way. Trainyard also lets you upload your solutions to help other users. If you get stuck on a level, you can always view how other users solved those levels on the Trainyard site.

Each level will have a star amount it's worth. You'll need to collect a certain amount of stars in order to unlock new cities. Once you collect all the stars, you'll unlock expert mode which will give you access to even more levels.

Levels also give you the option to clone them. This will let you solve the puzzle more than once since there can literally be hundreds of possible combinations for each level. So if you want a new challenge, try and solve the puzzles in more than one way. The only addition I'd really like to see is GameCenter integration.