Nineturn

Nineturn is a two player board/strategy game.
Challenge your friends or random opponents in this refined game.
It is also possible to have two players on the same mobile or tablet.

There are two game boards: 4x4 boxes and 9x9 boxes.

Rules for game board with 4x4 boxes:
Digits 1 to 4 shall be placed in such a way so that they are within each square, in each row and in each column. First, four digits shall be placed in the middle. Once that is done must digits only be placed so that one or more of the opponent's digits are "surrounded", horizontally, vertically or diagonally. The opponents "surrounded" numbers then passes to the player. The game ends when all boxes has been given a digit or when there is no playable box left. The player whose summed numbers are the highest wins.

Rules of the game board with 9x9 boxes:
The rules are the same as for 4x4 except that the numbers 1 through 9 must be placed in each square, row and column, and the game begins with that nine digits are placed in the middle.

When it's a player's turn, the possible digits that can be used and the boxes there they can be place are marked, therefore, a game can always play through without getting stuck on that one does not find any solution.