php captcha question for phpbb forum

Hi, I have a forum which I want to put an extra captcha on. A question like "is fire hot or cold". You have probably seen it.

What I need is someone to point me to a tutorial on how to implement it.

thanks

 

Check out this link on the phpBB forums, it should help.

http://www.phpbb.com/community/viewtopic.php?t=383305

 

thanks, but it was the specific thing i wanted. like here:

http://forum.waynerooneyonline.com/profile.php?mode=register&agreed=true

"how much is 3+5"

 

It's the same thing. You can specify you own questions with that mod and your own answers.

So you can create 5 + 3 equals etc.