Brain Test Level 79 Answer
Pressing the TV's power button, then hunting for a plug or a second cable end to join up. The cable is cut and nothing in the room will mend it, so the level looks unsolvable with the pieces provided.
The puzzle
Turn on the TV.
The answer
Put one finger on each end of the broken cable and hold them there. Your body bridges the circuit and the TV switches on.
What most people try first
Pressing the TV's power button, then hunting for a plug or a second cable end to join up.
Why that is the answer
The cable is cut and nothing in the room will mend it, so the level looks unsolvable with the pieces provided. The missing conductor is you. Put one finger on each severed end and hold both at once: your own body closes the circuit and the picture comes on. It is the first level that asks you to treat your hands as an object in the scene.
If your level 79 looks different
Unico Studio shuffles level numbers between game versions and platforms, so the puzzle on your screen may carry a different number from the one here. If the question above is not the one you are looking at, the full levels 51 to 100 walkthrough lists every puzzle in this stretch by its question, which is easier to match than a number.