Cursor*10

I found a game with a very unique and interesting gameplay, one which was so fresh that I had never seen before. I was so impressed by the game that I had to introduce it here.
I can't reveal much about the game without spoiling it. All that I can say is that the game requires you to "Cooperate by oneself ?!".

By the way, my (unimpressive) high score is 139. It is probably easy to beat this, but I don't want to click madly again.

Hope everyone enjoys this short game.

Test your Induction

The following sequence of three characters obeys a certain secret rule.

2, 4, 6

Your task is to infer the secret rule. To help you to discover the secret rule, you can produce any number of three character sequences for testing. I will then reply whether the produced sequence(s) obey the secret rule. (Pls try to propose sequences only in the tagboard; I will update the tested sequences in this post.)

As you can propose any number of character sequences for testing, you should only attempt to report the secret rule when you are absolutely sure that you have the correct rule in mind. To keep the game suspenseful, post rules only in the comments.