In Orbit is a gravity puzzle: you launch a body into space and the planets pull it as it travels, so a shot that looks wrong can curve into exactly the right path — and a shot aimed straight at the target usually misses.
It's the slingshot manoeuvre as a game mechanic, and once it clicks, planning a three-planet arc is genuinely satisfying.
Every planet pulls the moving body toward it, more strongly the closer and larger it is — so trajectories curve, and you aim around obstacles rather than through them.
Using a body's gravitational pull to change your direction and speed without spending fuel. It's a real spaceflight technique and it's the core mechanic here.
Yes — drag and release. Nothing to install.