Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

I have the weight companion cube, but I don't know how to use it. What should I do with the weight companion cube? I have nothing to do about that item.

it's... your companion. It accompanies you. You don't use it for anything else.

I gather you haven't played portal, have you.

I'll delete this SPOILERY comment soon.