What Is Fog of War? — Hidden Information on Strategy Maps

Fog of war is the name strategy games give to partial map information — territory, units, or resources the game hides until you earn vision. Borrowed from military jargon, it is now a design pattern spanning RTS, 4X, tactics, and browser restoration sims. This informational guide defines fog types, explains why designers use them, and shows how [TerraBite](/play) implements sector fog with energy-cost scanning.

Commercial game list: strategy games with fog of war exploration. Broader discovery mood: strategy games about map discovery. Hub: Hex & Exploration.

Core idea: imperfect information on the map

Perfect information strategy — full map visible from turn one — encourages pre-calculated openings. Fog introduces uncertainty:

• Where are resources?
• Where is the enemy?
• Is that tile safe to build on?

Players pay time, units, fuel, or energy to reduce uncertainty — creating drama and pacing.

Common fog of war types

Hard fog (unseen)

You know nothing — black map or cloud shader. Common in early exploration phases.

Soft / memory fog

You saw terrain before but live unit data is stale — classic RTS behavior when scouts leave.

Shroud / scannable borders

Adjacent tiles become interactable reveals — TerraBite's scannable state fits here: next to revealed territory, pay cost to scan.

Line of sight

Elevation, forests, and units block vision cones — tactical fog.

Expedition fog

World-map regions hidden until missions return — colony strategy pattern.

Visibility states in TerraBite (official)

TerraBite Phase 1 uses three exploration states on its hex-staggered map:

Scanning consumes energy (see in-game balance). This couples fog to economy — you cannot reveal the entire map instantly without investing in Solar Arrays, Battery Nodes, and planning.

For step-by-step player guidance, read the official [TerraBite exploration guide](/guide/exploration) — mechanics, routines, and how scanning interacts with ruins, wetlands, and contamination.

Why designers use fog of war

Pacing — early game discovery, midgame exploitation.

Risk — expansion into unseen contamination or enemies.

Replayability — seeds hide different layouts.

Multiplayer fairness — prevents screen cheating in RTS.

Resource sinks — scans and scouts spend budgets meaningfully.

Design essay: exploration in strategy games.

Fog vs map discovery (terminology)

• Fog of war — mechanic and rules (this article).
• Map discovery — player experience of uncovering worlds (map discovery guide).

A game can have fog with poor discovery pacing (grind) or discovery joy with light fog (procedural surprises). Evaluate both.

Fog in subgenres

RTS — unit sight radius, stealth, detector units.

4X — explorers, satellites, ancient ruins revealing chunks.

Tactics — pod activation when entering unseen tiles.

Browser restoration — TerraBite sector scans pushing ecological recovery frontier.

Player tips for fog systems

1. Budget reveals per turn/session — avoid reveal bankruptcy. 2. Expand in wedges — each reveal unlocks multiple scannable neighbors on hex-style maps. 3. Do not build blind — especially when contamination hides until scan (TerraBite). 4. Remember memory fog lies — RTS terrain memory may not show current enemy positions.

Short session routines: map strategy games short sessions.

Fairness and UX

Good fog communicates what you know, what you knew, and what you never saw. Bad fog hides unfair spikes — random enemies spawning in unseen tiles without telegraph. Informational design literacy helps you judge titles fairly in reviews and purchase decisions.

Accessibility: communicating fog to all players

Fog systems should not rely on color alone — patterns, tooltips, and state labels (hidden, scannable, revealed in TerraBite) help colorblind players. Memory fog in RTS titles sometimes confuse newcomers who do not realize terrain memory differs from live intel — good tutorials clarify the distinction early.

Relationship to restoration and contamination reveals

In TerraBite, fog hides contamination until scan — a specific risk type. Other games hide enemy stacks, resource voids, or story events. Tag which hidden information type a title uses when recommending fog games — players seeking eco-recovery surprises differ from RTS spies seeking army counts.

Historical origin of the term

Wargame designers borrowed fog of war from Carl von Clausewitz's metaphor for battlefield uncertainty — not literal weather fog. Modern strategy uses shader clouds and black shroud alike; the design idea remains limited intel, not meteorology simulation.

Fog in tutorials and onboarding

Games that dump full maps in tutorials then enable fog in campaign confuse players. Better onboarding introduces fog on small sandboxes — TerraBite's early sectors and official exploration guide follow that pattern by keeping initial revealed cores readable before large-map scanning.

Relationship to perfect-information puzzles

Some strategy subgenres — puzzle tactics, optimization challenges — intentionally omit fog. Comparing them to fog titles clarifies genre expectations: Into the Breach teaches tile tactics with full information; TerraBite teaches resource-scan tradeoffs with hidden sectors. Neither approach is "more strategic"; they train different skills.

Glossary quick reference

Shroud — never seen. Memory fog — terrain remembered, units unclear. Scannable — can pay to reveal now (TerraBite). Revealed — full tile data. Using consistent terms helps you compare games fairly in reviews and purchase research.

Try fog mechanics interactively

[Play TerraBite](/play) to experience hidden → scannable → revealed loops on a procedural map. Follow the [exploration guide](/guide/exploration) for official mechanics. Browse commercial comparisons on strategy games with fog of war or the hex strategy hub.