Bridges puzzle game(3/100)

Bridges puzzle game is a part of Simon's puzzle collection ported to Android.
It is the 3rd puzzle game provided by "poppan". Here is the rule of the game.

You are given a set of islands distributed across the playing area.
Each island contains a number. The goal is to connect the islands together with bridges, in such a way that:

1.) Bridges run horizontally or vertically.
2.) The number of bridges terminating at any island is equal to the number written in that island.
3.) Two bridges may run in parallel between the same two islands, but no more than two may do so.
4.) No bridge crosses another bridge.
5.) All the islands are connected together.