Help search an episode?
Well the episode as I remember goes like this...
People got on a bus, they were sleep gassed and put to a jigsaw like game. The first game was a puzzle game where the answers are the codes for the door and if you didn't get out and remove the pirate mask you'll explode, killing a mother. Second game is a searching game where a kid gets killed after touching a picture frame with something in it (it was labels if I'm correct) and the kid dies after getting punctured by the spikes on the back of the picture frame which were laced with poison.... And then the solving happens.
edit: extra info
the mother was blonde and quite old actually, and during the investigation, it was shown that there was a hidden room behind the wall and the glasses on her pirate mask was upside down. meanwhile the kid who was a boy was probably a teen same blonde hair and the search puzzle's answer was the only thing he could understand.
I'm not sure if this is even detective Conan but please do let me know if it is or isn't.