The 4th difficulty tier in the game, also known as “T4”. Reaching wave 100 unlocks tier 5.

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See this for strategies to unlocking higher tiers: Tier Unlock Strategies & Tips, including T15 W300.

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ℹ️ Tier Unlocks

• Tier 4 unlocks

💡 Related Tips

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⁉️ Related Frequently Asked Questions

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📜 Related Guides & Strategies

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🛠️ Related Tools & Resources

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🎨 Similar Category Items

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