There were four "interviews":

• A phone screen with a recruiter.
• Another phone screen with a more local recruiter.
• A first round of interviews on-site.
• A longer interview on-site afterward.

All of the in-person interviews were whiteboard, conversation style, where I wrote functions/code to illustrate my answers.

All were puzzle-type questions.

Many books can help prepare you for this kind of thing.

I don't have a specific one in mind.

I would not say that they were trick questions in any way; they were more algorithm-based.