grabbing physics object with *use

Ok, so maybe this is obvious, but I haven't been able to find it anywhere:

I want to make a puzzle involving pieces that slide around on a surface that will go together to make a final pattern and unlock something. You know, like those pictures that are scrambled?

I thought I could do it with physics objects that the player could grab with the E button and drag around. I was dismayed to find that I can't even get anything to be able to be dragged! I can move objects with the grav gun, but not with the E button. I've tried everything I can think of and still no love. Any help is appreciated.

If it's too heavy it can't be picked up with +use (if it's really heavy not even with the ggun). Try lowering the mass (0.01) property.

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Why snark works.

there may also be boxes that need to be checked in the flags tab of the model properties.

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i eat paint