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The AI Systems of Left 4 Dead - Valve

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Goal: Promote Replayability<br />

‣ Static placement <strong>of</strong> enemies and loot hinders<br />

replayability<br />

• Players are good at memorizing all static locations<br />

• Removes suspense <strong>of</strong> not knowing what will happen next<br />

• Results in “optimal strategy” that works every time<br />

• Players expect everyone to have memorized all encounters<br />

• Kills cooperation and degenerates into a race<br />

‣ Even multiple sets <strong>of</strong> manually placed triggers/scripts<br />

fails<br />

• Players learn all <strong>of</strong> them, and if they don’t see A, they<br />

prepare for B or C, etc.

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