This is my son’s room:it’s mostly Lego. After I put away the Mr. Potato Heads and the Fischer Price castle set, all I was left with was Lego. I tested a retrieval method suggested by my aunt, a sock put over the suction intake of a vacuum cleaner.
I used my hand sized vac and a wee sock with no match.
I was careful to leave a little bit less than just enough sock so when the suction was activated the sock couldn’t be pulled into the vacuum.
My finger is pointing to the length of the suction intake.
He has a very dense pile carpet in his room so the tiniest pieces of Lego burrow down deep to foil feet and knees passing overhead. The sock/vac set up took care of them, even the ones I couldn’t see. I would fill the sock then turn the vac off and let the pieces fall into a bucket.