Prevent bots from regietering?

[white-k]

I have SMF 2.0.15 installed.
Recently I've seen a great influx of spam registrations.

What is the best way to prevent bots from registering?

[Shambles]

Spam - my forum is flooded with spam, what can I do

[Steve]

To expand on the 'verification questions' portion in the link Sh@mbles gave you:

http://www.simplemachines.org/community/index.php?topic=531660.msg3776163#msg3776163

[white-k]

Thanks for the pointers!

By the way... does reCAPTCHA work well?
I've noticed this forum very uses it.

[Shambles]

... does reCAPTCHA work well?

How many websites have you seen using it?  I've seen dozens of thousands. I'd say it works well, for the uses to which it's put.