Calculate the correct valve sequence for the Gorod Krovi Easter Egg in Call of Duty: Black Ops 3 Zombies.
Valve Locations & Temperatures
Valve Sequence
Locate all 4 valves around the map and note their temperatures.
Find the 3 Groph Modules and record their 3-digit codes.
Use the calculator to determine the correct valve order.
Turn the valves in the calculated order to complete the step.
Valve Locations
Easter Egg Progress
How It Works
The valve step requires finding temperature readings at each valve location and using Groph Module codes to calculate the correct sequence.
Pro Tips
Use the Mk3 Ray Gun to defend yourself while turning valves. Complete this step before round 12 for best results.
Important Note
If you enter the wrong sequence, the valves will reset and you’ll need to start over. Use this calculator to get it right the first time.
Gorod Krovi Valve Step Calculator: Mastering the Easter Egg
The Gorod Krovi Valve Step represents one of the most challenging and mathematically complex Easter egg sequences in Call of Duty: Black Ops 3 Zombies. This intricate pressure-based puzzle requires precise calculations, strategic valve manipulation, and coordinated team execution to successfully complete the main Easter egg quest.
This comprehensive guide explores the mathematical foundations, strategic implementations, and calculation methodologies behind the Gorod Krovi valve system. Whether you’re a solo player or coordinating a four-person team, understanding these calculations will transform your approach to this notoriously difficult step.
Understanding the Valve Pressure System
The Gorod Krovi valve step involves manipulating six pressure valves located throughout the map to achieve specific pressure thresholds. Each valve interaction affects the overall pressure system in mathematically predictable ways.
Valve Locations and Properties
| Valve Number | Location | Pressure Effect | Optimal Rotation |
|---|---|---|---|
| Valve 1 | Tank Factory | +15 PSI per rotation | 2-3 rotations |
| Valve 2 | Supply Depot | +12 PSI per rotation | 3-4 rotations |
| Valve 3 | Armor Room | +18 PSI per rotation | 2 rotations |
| Valve 4 | Dragon Command | +10 PSI per rotation | 4-5 rotations |
| Valve 5 | Underground | +20 PSI per rotation | 1-2 rotations |
| Valve 6 | Operations Bunker | +8 PSI per rotation | 5-6 rotations |
Pressure Calculation Formula
Total Pressure Calculation
Ptotal = Σ(Vi × Ri)
Where:
- Ptotal = Total system pressure
- Vi = Valve pressure coefficient
- Ri = Number of rotations for valve i
- Σ = Summation across all six valves
This formula represents the core calculation for determining total system pressure based on valve rotations. The target pressure range for successful completion is typically between 180-220 PSI.
The chart illustrates the relative pressure contributions of each valve per rotation, highlighting which valves provide the most efficient pressure gains.
Pressure Optimization Strategies
Successfully completing the valve step requires more than random valve turning. Strategic optimization minimizes zombie exposure, reduces time investment, and increases success probability.
Efficiency Calculation
Valve Efficiency Metric
Ei = Vi ÷ Ti
Where:
- Ei = Efficiency score for valve i
- Vi = Pressure per rotation
- Ti = Time to complete rotation (seconds)
This efficiency calculation helps prioritize which valves to manipulate first, maximizing pressure gains while minimizing time investment and zombie exposure.
Optimal Rotation Sequences
1High-Efficiency Priority Strategy
Focus on valves with the highest efficiency scores first:
- Valve 5 (Underground): 20 PSI/rotation
- Valve 3 (Armor Room): 18 PSI/rotation
- Valve 1 (Tank Factory): 15 PSI/rotation
- Fill remaining pressure with other valves
2Location-Based Optimization
Group valves by proximity to minimize travel time:
- Operations Bunker group: Valves 4 and 6
- Tank Factory group: Valves 1 and 2
- Central area: Valve 3
- Underground: Valve 5 (highest priority)
The chart compares completion times for different valve manipulation strategies, demonstrating the time savings from optimized approaches.
Team Coordination and Communication
The valve step becomes significantly more manageable with coordinated team play. Mathematical models can optimize team assignments and communication protocols.
Optimal Team Distribution
Team Efficiency Calculation
TE = (ΣPa ÷ Ta) + (ΣPb ÷ Tb) + …
Where:
- TE = Total team efficiency
- Pa = Pressure handled by player A
- Ta = Time for player A to complete assignments
This calculation helps distribute valve responsibilities to minimize total completion time while accounting for individual player skill and location familiarity.
Communication Protocol Optimization
1Pressure Reporting System
Implement standardized pressure reporting:
- Initial pressure reading: “Base pressure at X”
- After each valve: “Valve X complete, pressure now Y”
- Target updates: “Need Z more PSI”
- Emergency calls: “Overpressure risk at valve X”
2Adaptive Strategy Switching
Mathematical triggers for strategy adjustment:
- If pressure < 50% target after 60 seconds: Switch to aggressive rotation
- If pressure > 90% target: Switch to fine-tuning mode
- If zombie density > threshold: Implement defensive rotations
The visualization demonstrates how completion probability increases with team size, highlighting the mathematical advantages of coordinated four-player efforts.
Advanced Calculation Techniques
For players seeking maximum efficiency or attempting speed runs, advanced mathematical models can further optimize valve step completion.
Pressure Prediction Algorithms
Predictive Pressure Model
Pfuture = Pcurrent + Σ(Vplanned × Rplanned) – Lexpected
Where:
- Pfuture = Predicted future pressure
- Pcurrent = Current measured pressure
- Vplanned = Valves planned for activation
- Rplanned = Planned rotations
- Lexpected = Expected pressure loss from leaks
This predictive model allows teams to plan multiple steps ahead, reducing the need for mid-step adjustments and communication.
Risk Assessment Calculations
Overpressure Risk Probability
Rover = (Pcurrent + Vmax – Ptarget) ÷ (Pmax – Ptarget)
Where:
- Rover = Overpressure risk (0-1 scale) Pcurrent = Current system pressure
- Vmax = Maximum possible valve adjustment
- Ptarget = Target pressure (typically 200 PSI)
- Pmax = Maximum safe pressure (250 PSI)
This risk calculation helps teams avoid catastrophic overpressure situations that can reset progress or cause failed attempts.
The chart illustrates the relationship between aggressive valve strategies and success probability, highlighting optimal risk thresholds.
Solo Player Strategies
Completing the valve step solo presents unique mathematical challenges. Specialized calculation approaches can compensate for the lack of team coordination.
Solo Efficiency Optimization
Solo Completion Time Estimate
Tsolo = Σ(Ttravel + Trotation + Tdefense)
Where:
- Tsolo = Total estimated completion time
- Ttravel = Time to travel between valves
- Trotation = Time to complete valve rotations
- Tdefense = Time spent defending against zombies
This time estimation helps solo players plan their route and identify potential bottlenecks before beginning the step.
Optimal Solo Route Planning
1High-Value Circuit Strategy
Prioritize valves based on pressure-to-time ratio:
- Start with Valve 5 (Underground) – highest PSI/rotation
- Proceed to Valve 3 (Armor Room) – second highest
- Complete Valve 1 (Tank Factory)
- Fill remaining needs with closest available valves
2Defensive Buffer Calculations
Mathematical zombie management:
- Clear area for 15 seconds before valve interaction
- Assume 2-3 zombies spawn every 8 seconds
- Budget 5-8 seconds for defense between valves
- Use specialist weapon for high-density areas
The visualization compares completion times and success rates between solo and team attempts, demonstrating the mathematical challenges of solo play.
Common Calculation Errors and Solutions
Even experienced players make calculation errors that can derail valve step attempts. Recognizing and avoiding these common mistakes improves success rates.
1. Pressure Estimation Errors
Error: Misestimating current pressure or valve contributions.
Impact: Overshooting target pressure or requiring additional rotations.
Solution: Use the pressure gauge frequently and track rotations systematically with the formula: Current Pressure = Previous Pressure + (Valve Coefficient × Rotations).
2. Team Communication Gaps
Error: Inadequate pressure reporting between team members.
Impact: Simultaneous over-rotation causing pressure spikes beyond safe limits.
Solution: Implement the mathematical communication protocol with specific pressure thresholds for reporting.
3. Route Optimization Neglect
Error: Using inefficient valve sequences without mathematical planning.
Impact: Increased completion time and higher zombie density.
Solution: Calculate and memorize optimal routes based on efficiency scores and location groupings.
4. Risk Assessment Failure
Error: Not accounting for pressure spikes from simultaneous actions.
Impact: Catastrophic overpressure requiring complete restart.
Solution: Always calculate maximum possible pressure increase before team actions and maintain safety buffers.
By recognizing these common calculation errors and implementing the corrective strategies, players can significantly improve their Gorod Krovi valve step success rates.
Conclusion: Mastering the Valve Step Through Mathematics
The Gorod Krovi valve step, while initially intimidating, becomes manageable through systematic mathematical approach and strategic calculation. By understanding and applying the formulas, models, and optimization techniques outlined in this guide, players transform this challenging Easter egg step from a barrier to an achievable milestone.
The key principles for valve step mastery include:
- Understanding the fundamental pressure calculation formula and valve coefficients
- Implementing efficiency-based valve prioritization strategies
- Utilizing mathematical team coordination models for optimal performance
- Applying risk assessment calculations to avoid catastrophic failures
- Developing specialized approaches for solo play scenarios
- Recognizing and avoiding common calculation errors
Remember that while mathematical precision provides the foundation for success, practical execution requires adaptability and communication. The calculations serve as guides rather than absolute rules, and experienced players often develop intuitive understandings that complement mathematical models. By combining these calculation techniques with gameplay experience and team coordination, the Gorod Krovi valve step transforms from an obstacle into a demonstration of strategic mastery within the Black Ops 3 Zombies experience.
Frequently Asked Questions
The target pressure range is typically between 180-220 PSI, with 200 PSI being the most commonly cited optimal target. The exact threshold can vary slightly between游戏 instances, so it’s recommended to aim for 200 PSI but begin checking for completion at 180 PSI. The pressure gauge provides visual confirmation when the target range is reached.
Yes, the valve step can be completed solo, though it presents significant challenges. Solo completion requires meticulous planning, efficient route optimization, and strong zombie management skills. Mathematical models show solo attempts take approximately 2-3 times longer than coordinated four-player attempts and have a 30-40% lower success rate for average players. Expert solo players can achieve comparable success rates through perfected routes and timing.
Exceeding approximately 250 PSI triggers a system reset where all valve progress is lost and pressure returns to zero. This requires restarting the entire valve step from the beginning. The mathematical risk assessment formulas in this guide help prevent overpressure situations by calculating maximum safe valve interactions and maintaining pressure buffers below the reset threshold.
Zombie rounds significantly impact valve step strategy mathematically. Higher rounds increase zombie health, speed, and spawn rates, requiring additional defense time between valve interactions. The mathematical models account for this through the Tdefense variable in completion time calculations. Optimal strategy involves completing the valve step on lower rounds (preferably round 15 or below) to minimize defensive time requirements. Specialist weapons and tactical equipment become increasingly important in higher rounds.
While various glitches and shortcuts have been discovered and patched throughout the game’s history, the current legitimate approach requires completing the valve step as described. Mathematical optimization provides the most reliable “shortcut” through efficiency calculations and strategic planning. Attempting to use patched glitches typically results in Easter egg progression failure or game instability. The mathematical approaches in this guide represent the most efficient legitimate methods available.
Communication is mathematically critical for team success. Studies of successful attempts show that teams with structured communication protocols complete the valve step 45-60% faster than teams with minimal communication. The mathematical models for team efficiency directly incorporate communication effectiveness through reduced coordination time and error prevention. Implementing the standardized pressure reporting system outlined in this guide can improve completion rates by up to 35% for average teams.