Just switch to Anti-Gravity Dimension and things begin to float upward.
To do this, use one of the inventions, a glove that can change size and has the property of modifying the chemical composition of materials, making items as light as a feather no matter what weight or volume. Now, your job is to find—and ultimately rescue—your uncle, by using his newest invention, the Interdimensional Shift Device (or IDS), to switch between dimensions and solve puzzles. That sofa too heavy to move? And third, the house seems to be even weirder than you remembered it. First, he’s not there to greet you.