Spacetime Bend
Drag a black hole to bend a light ray onto the detector — and line it up perfectly for an Einstein ring.
How to play
Drag the mass so the bent ray hits the detector; later levels ask for a ring, which needs the source, lens and observer aligned. Hint: the bend angle α ≈ 4GM/(bc²) grows with mass and shrinks with distance from the beam. Clear all four levels.
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