Here are a couple of ideas for hard mode
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Animals spook very easily, if they see you running they will spook.
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Animal population is much lower and not so easy to find.
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Animals will return after days (in game, explained at idea 4).
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Days, nights, weeks, maybe months and years counter, so let's say that I am hunting at a need zone and after I shoot a deer and I pass the harvest check, the need zone will be gone and the hunting presure will disapear after a day or more depending on the animals' class.
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Fainthing, no more infinite running.
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Costumes will afect you, it will be fun needing to change costumes depending on the reserve.
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One life only, no one will rage.
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Rewards system, every 10k cash you will recive a random reward, but keep in mind not every 10k cash like... don't spend the cash if you want more rewards like this: 10k rifle, 20k caller, 30k costume and so on until 100k where I really want a dog for it but like a bad one not so good like the DLC one (I am greedy sometimes but the reward can be changed).
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Callers won't be so much efective anymore.
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The AI of the animals should be more advanced for this mode.
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Hard mode is separate from the normal one.
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Don't make it an DLC.