From GameBrew - a wiki dedicated to Video Game Homebrew.
Tic-Tac-Toe is a classical board game. This version is themed to the virtual and futuristic style of Megaman.
Connect three dots of the same color to win. The red dots are represented with an image of Zero, and the blue ones with an image of Megaman.
The first player will be blue, and the next would be red.
In addition, there are some Megaman themed animations and music during the game.
Stylus - Full control of the game
NDS with Acekard 2