Thank you for reviewing my game. It's really exciting to see this idea I had a kid come to life. A few thing to mention about check-4:

+ It's actually 2 games in 1 – squares and lines are two seperate modes of play.
+ The board size is variable from 6 x 6 to 10 x 10. Bigger boards require more strategy and take longer to play.
+ You can play 1 to 4 players. And EACH player can be a computer or a human. So, if you want you can test your skills against three computer players. And believe me, it's HARD – I haven't been able to win against 3 computer player yet! It might be impossible?

Thanks and hope you enjoy the game!

Ken