Since this game has hidden bosses, loot chests, and other things to find, it would be cool if there were more things to be found, like closets with rare (or weak) armor, hidden gun cabinets or silver coins hiding around the game. It would also be neat if you could find and ride vehicles that are found in a world.
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It does have that in a form of Treasure Chest & RNG but I get what you mean.