Find what's broken! (Or unguarded!) One button looks over every building on the planet or platform you're viewing and lists what's likely wrong: machines nothing feeds or empties (items and fluids), loose inserters, missing recipes, empty drills, things out of fuel, dead pipe networks, lone underground belts, power problems and split networks, gaps in your defenses that enemies could walk through, and much more! Problems are circled on the map and in the world; click one to go there.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.