O5

Tic-Tac-Toe - is a well known game. Everybody from kids to aged are got into rush trying to make the three-in-a-row prior to an opponent. And you know, it's very easy to make it never happens.

But things are changed. In this game you will play on a larger board of 20x20 and have to make five "O" in a row inetead. And it will not be too easy.

Features:

- Strong AI
- Three difficulty levels
- Ability to undo last moves