If ur confused and don't know what a "challenge" is, check out this post: #1090220436589133945
Robots that are running across the city/floor, similiarly to cop robots, have a line of sight in front of them. If they see you, you cannot move until they look away. If you do, you get killed. You can move if you are hiding behind something or someone else is in front of you. NPCs will also stop at robots that are looking at them.
Upon beating, challenge unlocks: (No good idea yet. Suggest one and i'll add it)