Hydrogen Bomb Guide for OpenFront.io
Main Takeaway: The Hydrogen Bomb is the most powerful strategic weapon in OpenFront.io, capable of devastating large swaths of territory and manpower. Deploy it via a Missile Silo only in late–game scenarios when you have amassed at least 5 000 000 gold and sufficient defenses against enemy SAMs.
1. Overview
The Hydrogen Bomb is a late–game missile that delivers unparalleled destructive power to a target region. When launched from a Missile Silo, it:
- Sustains an aerial flight over long range before impact.
- Delivers a two‐stage blast: an inner devastation zone and a wider damage perimeter.
- Leaves radioactive fallout that reduces movement speed and defense of units in affected tiles.
2. Requirements & Deployment
| Requirement | Description |
|---|---|
| Building prerequisite | Missile Silo (must be constructed and cooled down) |
| Gold cost | 5 000 000 gold |
| Silo cooldown | 75 ticks (7.5 seconds) |
| Tech prerequisites | None beyond silo access |
To use:
- Build or upgrade a Missile Silo.
- Accumulate ≥ 5 000 000 gold.
- Select your target tile within range.
- Launch the Hydrogen Bomb.
3. Flight & Interception
| Attribute | Value |
|---|---|
| Maximum range | 120 tiles |
| Flight speed | 6 tiles/tick |
| SAM interception range | 80 tiles |
| SAM hit chance | 50% against warheads |
Enemy SAM Missiles and SAM Launchers can intercept your Hydrogen Bomb if positioned within 80 tiles of its path; they have a 50% chance to shoot down the warhead.
4. Blast Characteristics
The explosion comprises two concentric zones:
| Zone | Radius (tiles) | Effect |
|---|---|---|
| Inner | 80 | Maximum destruction of units and buildings in zone. |
| Outer | 100 | Partial destruction and heavy troop casualties beyond inner radius. |
Casualty calculation for humans in affected tiles uses:
$$
\text{troopLossFactor} = \frac{5 \times \text{humans}}{\max(1, \text{tilesOwned})}
$$
This yields severe manpower loss proportional to population density.
5. Fallout Effects
After detonation, all tiles within the outer radius become radioactive:
- Movement penalty: Units take longer to traverse fallout tiles.
- Defense reduction: Affected tiles suffer a defense modifier of $$5 - 2 \times \text{falloutRatio}$$, where falloutRatio is fraction of map contaminated.
- Fallout persists indefinitely, hindering both attacker and defender until remapped.
6. Strategic Usage
- Timing: Deploy only in late game due to high cost and cooldown.
- Target selection: Aim for clusters of enemy SAMs or high-value territories—e.g., enemy capitals or chokepoints.
- Follow-up: Use conventional troops to occupy fallout zones, leveraging weakened defenses.
- Countermeasures: Enemy SAM coverage or MIRV barrages can thwart your hydrogen strike.
7. Comparative Summary
| Weapon | Cost (gold) | Inner/Outer Radius | Range | Cooldown (s) |
|---|---|---|---|---|
| Atom Bomb | 750 000 | 12 / 30 | 120 | 7.5 |
| Hydrogen Bomb | 5 000 000 | 80 / 100 | 120 | 7.5 |
| MIRV | 25 000 000 | 25 / 30 | 120 | 7.5 |