Knock Knock: Room Defense – Infinity Train Station Survival Tactics for Floors 424-426

The Infinity Train Station in Knock Knock: Room Defense represents a significant spike in difficulty, particularly as you approach the mid-400s. Floors 424 through 426 require a precise balance between early-game economy management and defensive structure placement to withstand the relentless ghost waves.

Core Survival Objectives for Floors 424-426

At this stage of the Infinity Train Station, the ghosts exhibit increased health pools and faster movement speeds compared to earlier levels. Your primary goal is to establish a sustainable gold income while simultaneously reinforcing your door to prevent a breach before your turret grid is fully operational.

Priority Setup Checklist

Bed Upgrade Priority: Focus on maximizing your sleep level as quickly as possible. Higher levels translate to faster gold generation, which is non-negotiable for keeping up with the rising cost of defensive upgrades.
Early-Game Barrier Reinforcement: Do not neglect your door health in the first 30 seconds. Even a few minor repairs early on can save you from a "Game Over" when the first major ghost wave hits.
Defensive Grid Expansion: Prioritize placing turrets in a staggered formation. This ensures that ghosts are consistently under fire as they move toward your room, rather than bunching up at a single point.

Resource Management Strategy

Efficient gold usage is the deciding factor in clearing these specific floors. If you find yourself struggling, analyze your spending habits during the first minute of the match.

Phase	Strategy	Objective
Opening	Aggressive Bed Upgrading	Reach the mid-tier income threshold before the first ghost arrives.
Mid-Wave	Balanced Turret Placement	Focus on high-damage output rather than slowing effects.
Final Wave	Emergency Door Repairs	Save enough gold to keep the door integrity above 50% during the final ghost rush.

Tactical Tips for Success

Avoid Over-Building: Placing too many low-level defensive structures can clutter your room and limit the space available for high-tier upgrades. It is more effective to have three high-level turrets than six basic ones.
Monitor Ghost Patterns: Observe the lane distribution. Floors 424-426 often feature ghosts that favor specific paths. Adjust your turret placement to mirror the ghost movement density.
Gold Efficiency: If the door health is holding steady, prioritize spending your gold on Bed upgrades rather than repairs. Only repair if the door is visibly flickering or showing critical damage indicators.
Static Defense vs. Utility: While utility items have their place, your primary focus for these levels should be pure DPS (Damage Per Second). The ghosts on these floors are tanky; you need raw power to clear them before they reach the threshold of your room.

By maintaining a strict cycle of upgrading your economy early and transitioning into heavy offensive structures, you can reliably clear floors 424-426. Remain patient, keep your door repaired, and focus your gold on the most impactful defensive assets.