We would actually qualify on both difficulty and terrain - see the image of my Unknown D/T chart. However for my nine puzzles for this challenge I have chosen a set that were all terrain 2.0.
D=1.0 GC1Y6RF I Have a Cunning Plan! (found 7 Sep 2009)
D=1.5 GC2P124 20th February #2 (found 20 Feb 2011)
D=2.0 GC1HFQ7 Downtown Hollywood (found 9 Jun 2009)
D=2.5 GC2AV5A Ke Nako (found 14 Jul 2010)
D=3.0 GC28QR6 The Pewley Brothers (found 23 May 2010)
D=3.5 GC2C24P Canaan (found 3 Oct 2010)
D=4.0 GC1EETA Julius (found 27 Sep 2009)
D=4.5 GC2429E Killer #4: Hung, Drawn and Quartered (found 20 Feb 2010)
D=5.0 GCTGBY Dorking by Pictures: Go West Young Man (found 25 Oct 2009)
More details here.
Today I had a day off work to take the kids off geocaching. We decided to come to Kent to pick up a few challenges and puzzles that I'd solved. This was the first.
We got the GPSr down to 1 metre but we couldn't see the stump. So we all spread out to look for it, but found nothing and ended up coming back together at exactly the same place. This time Bobcat spotted it - how did we miss that? All in all it only took a couple of minutes but we did feel a bit stupid.