Build Bridges! (original: Hashiwokakero) by Nikoli (famous for Sudoku) is a logical puzzle. It's also called Ai-Ki-Ai or Hashi.
You have to build bridges between the islands. Rules can be found in APP under Menu >> Preferences >> Tutorial
Features:
# Puzzle generator
# Select Difficutly
# Select size of puzzle
Good app, great value.
Great app, would highly recommend it!