You could try
www.airquiz.com
I have no experience of it and I would suspect it is entirely fixed wing based. In addition to the PPL Confuser, there is also a Q&A book by Jeremy Pratt and another one published by Airlife (from the top of my head). Have a look at the online flight and aviation suppliers (Transair, Flightstore, Pooley's etc).
Cheers
Whirls