Hashi is a typical puzzle game, where you try to connect islands with bridges.
The goal of Hashi is to connect every island with as much bridges as the number on the island displays. Two connecting islands can either have one or two bridges.
You win Hashi, when every island is connected either directly or indirectly with every other island. That means that they must build a closed network. But be aware, that bridges must not be crossing each other.
Enjoy it.