stealth is one thing, the challenge could be in the way you kill. every enemy must be killed within one second of the other to prevent alarm. this Idea would be best with working conveyor belts, or cranes, or timed explosives, or remote explosives. if you're seen, than you are shot. perhaps give the player a gun with limited ammo, or just a knife.
maybe make the challenge realism, get shot once and die. the challenge would be proper strategy in an environment where stealth is not an option.
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