Online logic game "Tic-tac-toe by Silverman"
This version of tic-tac-toe is played on a 4x4 game board. One player uses X's and the other uses O's. Players move in turn, each placing their tokens on the board with his/her turn. If a row of four identical tokens (either X's or O's) appears somewhere on the board - horizontally, vertically or on the upper-left to lower-right diagonal - the player who started the game wins. Otherwise the second player wins. If four identical tokens appear on the upper-right to lower-left diagonal, this is not a winning position and the play continues. (This is the change we made to the original rules.)
Read our gaming article "Tic-tac-toe by Silverman with our redaction of rules".
Download our freeware 3 Great Logic Games for Windows with the Tic-tac-toe 4x4.