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LOGIGRID Logic Problems are a challenging and fun way to develop your deductive reasoning and critical thinking skills. If you regularly do logic puzzles then you know how addictive they can be. If you're new to logic problems, they're simple to learn so you'll be solving them within minutes.

To solve LOGIGRIDs, you are given a scenario which describes the problem to be solved, followed by a set of clues from which you deduce the connections between groups of items such as people, places, objects, or dates. If you determine that a connection exists between the two items then you place a “dot” in the grid, if there is no connection then you enter an “X”. It's that easy!
LogiGrid iPad
 on your iPad
LogiGrid iPhone
LogiGrid iPhone
You only have to buy the LogiGrid Logic Problems app once. It runs on  your iPhone, iTouch, and iPad making use of each device's unique features.
on your iPhone
LogiGrid Logic Problem Puzzles
Logic Problems 
Harmony Applications
Available on the App Store