LOL -- this is one HG+ thing that ds6 did/does *not* do. He's not a puzzler!
Same with my DS4. I never could figure out why he wasn't into puzzles, as everything else was very typically HG+ activities. When I did the Ruf scales on him when he was younger, it was always the one thing that he wasn't quite up to par on. He does still like them, but is not great at jigsaw puzzles. But actually recently he started doing puzzles on jigzone and he likes that.
Funny puzzle story, last night DH was watching some news show while he was playing sequence with DS and President Obama was on the screen. DS turns around and says "hey, I just did a 36 piece puzzle of him on jigzone earlier today where he had a microphone in his hand and his thumb was up" I laughed and said "do you know who that is?" he says "yes, Barack Obama"