Tic-Tac-Toe online is a free game developed by Volodymyr Korotkov. It is a classic game that consists of a 3x3 or 10x10 grid where two players take turns placing their X or O symbol. The player who succeeds in placing three or five of their marks in a horizontal, vertical, or diagonal row wins the game.

The game offers three modes of play: single player, two players (computer and human), and online mode. In the online mode, players can play with friends or strangers from all over the world. The game also has three difficulty levels and offers simple graphics that are easy on the eyes. It supports all Android versions and is 100% free to play.