Bent Light

Aim each beam at the planet of the same color. Walls stop light. Black holes bend it, exactly the way general relativity says they should, so drag them into place and let gravity do the rest.

• Drag an arrow to aim, or a black hole to move it
• Hold Shift while dragging, or press F, for fine aim. On a phone, swipe the aim strip at the bottom
• Tab picks an arrow or black hole, arrow keys turn or move it (Shift: bigger steps), scroll turns arrows
• R restarts, Esc opens or closes this menu