ALL WILL FALL Physics & Building Guide

How the Physics Engine Works in ALL WILL FALL

ALL WILL FALL uses a real-time structural physics simulation that sets it apart from every other city builder on the market. Unlike games such as Timberborn or Frostpunk where structures are placed freely on a grid, every building in ALL WILL FALL has actual weight. The game engine calculates load distribution across your entire structure continuously — not just when you place a new building, but dynamically as your colonists move, resources pile up, and the tide shifts.

The core principle is simple: weight must be supported. A concrete floor panel weighs more than a wooden one. A storage silo filled with ore weighs more than an empty one. Stack enough unsupported mass and the game's physics engine will find the weakest point and snap it. This usually triggers a cascade — one collapse causes another, and suddenly your 12-story colony headquarters is a pile of debris on the ocean floor.

Weight flows downward through connected structures to whatever is touching the ground or a floating platform below. The game visualizes stress with a color overlay (accessible via the build menu): green means safe, yellow means approaching limits, red means imminent failure. You should check this overlay regularly, especially after adding new floors or heavy machinery.

Foundation Types & Ground Rules

There are three types of valid foundations in ALL WILL FALL: solid ground (rare elevated terrain), pre-existing structures like the Oil Rig starting platform, and floatable raft bases. Most of the game is played on water, so understanding how to anchor structures is critical from the very first minute.

Raft foundations are the most common early-game base. They float, but they have a buoyancy limit — overload them and they sink. Each raft tile has a listed weight capacity. A common beginner mistake is building upward without widening the raft base first. The golden rule: go wide before you go tall. Expand your base platform before stacking another floor.

Pile foundations are unlocked via the Engineers' research tree. These are driven into the ocean floor and provide dramatically higher load capacity than rafts. They are expensive and slow to build but essential for late-game mega-structures. Piles also resist tidal forces better, making them the preferred choice in scenario maps with aggressive tide cycles.

Multi-Layer Vertical Building Strategies

Vertical construction is the heart of ALL WILL FALL. Unlike most city builders that expand horizontally, the game rewards players who think in three dimensions. A well-designed tower can house production, storage, living quarters, and entertainment on a footprint smaller than a tennis court.

The key to vertical stability is the column-to-floor ratio. As a rule of thumb, you need at least one structural column for every 2×2 floor tiles at each level. Columns transfer load vertically; floors transfer it horizontally to the nearest column. A common mistake is building wide floors with columns only at the edges — the center sags under load. Place internal columns every 2-3 tiles for large floors.

Always taper your builds — make the base wider than the top. This mimics real-world skyscraper design and keeps your center of gravity low. A 5-wide-base pyramid structure can safely reach 8+ floors with standard materials. A 3-wide column that shoots straight up will topple at floor 4 in moderate wind conditions.

Cross-bracing is an advanced technique available once you unlock the Engineer's structural steel research. Diagonal beams between two columns on adjacent floors dramatically increase wind resistance and allow taller builds. In the Tornado scenario, cross-bracing is mandatory — without it, your upper floors will shear off at the first storm.

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Bridge Building & Reaching Remote Resources

Bridges in ALL WILL FALL are not cosmetic — they are structural challenges. A bridge must span open water between two anchor points. The longer the span, the more the bridge sags at its center due to gravity. For spans over 6 tiles, you must add suspension support: build a tall tower at the bridge's midpoint and hang tension cables (unlocked mid-game) down to the bridge deck.

The most common bridge failure point is the anchor connection. When you attach a bridge to a raft or pile foundation, the anchor point takes the full tension of the suspended span. Reinforce these points with double columns and ensure the anchor structure itself is rated for the combined load. Many players lose bridges not because the span failed, but because the anchor tower toppled first.

Drawbridges are available in the late game and allow colonists and resources to cross while ships pass underneath. They require an Engineer to operate and consume a small amount of electricity per activation. In tidal scenarios, drawbridges are invaluable — you can lower them at low tide when ships aren't needed and raise them when the tide brings trading vessels.

The Undo System — Your Best Defense Against Collapse

ALL WILL FALL includes a time-reversal Undo system that is more powerful than it first appears. Pressing Undo doesn't just cancel the last placed building — it rewinds the entire simulation state, including physics calculations, colonist positions, and resource states, by one discrete step.

You can stack Undo presses to rewind multiple steps. The game keeps a buffer of your last 20 actions. This means if you accidentally trigger a cascade collapse by placing one too-heavy item, you can undo back through the entire collapse sequence to the moment before the structural failure. No other city builder offers this level of forgiveness.

However, Undo has limits. It only tracks build actions, not time. If a collapse happens due to a storm event (not a placement you made), Undo will not reverse it — you'll need to use the game's separate save/load or the scenario's optional checkpoint system. The lesson: save manually before any storm warning, and use Undo liberally during construction phases.

Building Materials Comparison

ALL WILL FALL features five primary building materials, each with different weight, strength, and production cost profiles. Choosing the right material for each part of your structure is a key optimization challenge.

Wood is your starting material. It is light (low self-weight), cheap to produce from salvage lumber, and easy to work with. However, wood has the lowest load capacity of any material and degrades in the Flood scenario's saltwater conditions. Use wood for temporary scaffolding, early-game housing, and upper-floor lightweight structures where load demands are low.

Concrete is the mid-game workhorse. It is 3× heavier than wood but offers 5× the load capacity. Concrete is ideal for columns, foundations, and ground-floor industrial platforms. It does not degrade in water. The tradeoff is its production cost — concrete requires both sand and limestone resources, making it dependent on your resource supply chains.

Structural steel (late game) is the highest-strength material in the game, enabling the tallest possible builds and the longest unsupported bridge spans. It is extremely heavy, so steel should be used only where its strength is needed — primary columns and long-span beams. Using steel for floors instead of concrete will overload your foundations unnecessarily.

Recycled scrap is a special material gathered from ocean debris. It is unpredictable — scrap tiles have random strength values between wood and concrete. It is free and fast to deploy, making it excellent for emergency repairs after a collapse, but you should replace scrap with engineered materials as soon as your production catches up.

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