Roth has finalized his Tic-Tac-Toe game Tic-Tac XO.

Changes:

All new music, which you can hear in the downloadable NSF below
A couple of instruction screens
A very easy to locate easter egg that’s not shown in the screenshots here
Some minor cosmetic changes, seen in the screenshots below
A computer that is unbeatable without obtaining power-ups
A way to finish the game and get an ending screen

Discussion: http://nesdev.parodius.com/bbs/viewtopic.php?t=4123

http://robertlbryant.com/gaming/ttxo.htm