Wasteland 2.
There's a couple of places that need passcodes and figuring out riddles. Sometimes you team is smart enough to remember them, other times not so much.
It also comes in handy with Dialog Options when no one in your team has 'talking' as a primary stat. You can still punch in the triggering word manually.
You're basically the sixth member of the team if you can remember all that stuff. It's neat little feature. Pen and paper absolutely required.