井字棋 - Classic Puzzle Game

井字棋 is a classic paper-and-pencil game, also known as Tic Tac Toe.

FEATURES:

- lots of game modes (the classic 3x3. the 3D version 3x3x3 and other variants)

- 3 difficulties (easy, medium and hard)

- single player, two players on the same device

- google play games achievements

RULES:

- the board can be 3x3, 3x3x3, 5x5 or 7x7

- two players play alternatively, marking one empty cell at a time

- the objective (equal to 3, 4 or 5) is the number of markings to achieve in line (horizontally or vertically or diagonally)

- the 3x3x3 should be visualized as a cube (check the screenshots for some winning possibilities)

Stop wasting paper and save some trees! =)