A rogue planet is falling through a star system, and you can't touch it. Place moons, gas giants and black-hole seeds to bend its path, plan a few thrust pulses, then let go and watch. Get it right and it settles into orbit around its new sun.
There are 26 systems across single stars, binaries, Lagrange points and slingshots, plus a sandbox with time scrub. The gravity is real Newtonian physics, and it runs on iPhone, iPad and Apple Vision Pro.
