Hashiwokakero: Build Bridges

It is especially popular among fans of Sudoku.

Rules:
- You have to build bridges between the islands
- Each island shows the number of bridges built to it
- Bridges cannot cross
- The bridges will form a continuous link between all the islands

Features:
- 100 levels
- Each new level is more complicated than the previous one
- 3 types of levels
- All levels have a unique solution
- Absolutely free, no advertisements

History:
Hashiwokakero (橋をかけろ Hashi o kakero; lit. "build bridges!") is a type of logic puzzle published by Nikoli. It has also been published in English under the name Bridges or Chopsticks (based on a mistranslation: the hashi of the title, 橋, means bridge; hashi written with another character, 箸, means chopsticks). It has also appeared in The Times under the name Hashi. In France, Denmark, the Netherlands, and Belgium it is published under the name Ai-Ki-Ai.