The Studs of Stone. The Standard Median, #6

In the wake of a catastrophic planetary flood that leveled the coastal citadel, the "old-world" ways are the only path to survival. Under the Law of Structural Tension, the modern synthetic materials that once built the world now crumble into a corrosive sludge. A lone Master Mason is all that stands between the ruins and total erasure, tasked with reconstructing the primary seawall and residential sectors from the bare studs up.
Using manual stone-working techniques, the Mason must anchor the new city into the Bedrock Footing and master the art of Interlocking Tension to withstand the Corrosive Surge. Every granite block must be meticulously shaped to lock together using only gravity and friction. Under the skeptical, clinical eye of the Site Inspector, the Mason must prove that physical resilience and perfect geometric visualization can build a home that will never wash away again.