Barbican

You are the master engineer of a medieval siege. Build a counterweight trebuchet from real parts — counterweight mass, arm ratio, sling length, release pin — and every one changes where the stone lands. Loose a ranging shot, read the fall of shot, bracket it in. The wall is a structure, not a health bar: courses, a batter and a rubble core, damaged section by section, so working the low courses is how a breach actually forms. Ten castles, each with a weakness: mine under a tower, roll a belfry, or break their heart and take their surrender before winter closes the roads.