a freeroaming roguelike sort of game where i am allowed to use generic everyday objects (eg: books, bars of metal, hubcaps) to solve problems and use them as weapons based on their physical representation within the world and what i could logically do with objects with those properties
like, if i wanted to use a book as a weapon, i could spin it around, hold it so the binding is pointing outward and slam something with the pointed end at the bottom or top, or use a bar of metal as a weapon by swinging it like a makeshift polearm. you could use a hubcap as a sort of bashing weapon, use it's large surface to deflect or block blows and just throw the entire damn thing to attack faraway enemies
in addition, i could use normal weapons like swords and axes in a weird way, like 'throwing' my sword into close enemies and rushing in to grab my sword again and knock them away, forcing their body off of my sword so i could repeat the process, or throwing my entire forgetin axe like a discus- and, in addition, use these weapons as tools within the world, using them to hold open things or throwing them to dislodge faraway objects
maybe even enchanting them with enchantments that aren't just "fire damage" or "frost damage" like the ability to re-summon them to my hand on command by having them just shoot through the world back to me (like a boomerang) or just to have them magically appear in my hand again after some time, or have them be magically lightened or made heavier or magically propel themselves FROM my hand on command, allowing me to change up my fighting style by having my sword suddenly eject itself as a sucker punch or blocking technique
so i guess the best way to go about this would be virtual reality gloves or just a really tactile mouse or something, because in order to operate two game-arms with any real efficiency i would need a more capable peripheral then just a normal-ass mouse
in a similar vein, everything- literally everything, weapons, items, furniture- could be improved with a fairly vague group of enhancements like 'sharpness' and 'lightness' and 'aerodynamicness' which didn't change the model or texture of the weapon as much as it did it's physical values, so if you add Sharpness II (out of presumably like X) to, say, a large book, any cutting points it has on it's physical form would be amplified to twice the original value (or maybe like 1.25x) and thus it would essentially be 'twice as sharp', but you could still hold it by not-sharp points and not cut up your hand. also, yes, double-damage paper cuts.
then, you could combine these things WITH other things to create new physical objects by either literally just attaching the two things together (eg. taping a book to a chair) or stripping them down to baser components, then attaching those components to one another (stripping down a book into bindings and paper and a chair into a bunch of chair pieces, then rolling up a piece of paper around a particularly long chair piece to make a sort of chair-piece-club with a paper grip). you can attach components together using axles or by fastening them together and these would all require objects buyable at shops or fashionable out of certain base parts (with tools) and would not necessarily always be 100% effective; for instance a wooden dowel securing together an enormous lead sawblade would not hold for very long, and the sawblade would be liable to break off and maybe bisect your arm or something, or you could duct tape two pieces of heavy metal together but not necessarily very WELL because duct tape might not be strong enough, and a stronger fastener (screws, nails, glue) might be more useful / economical
but since you could apply this kind of thing to any forgetin thing at all within the game world you could wander around with a backpack full of seemingly-arbitrary-things attached to other-seemingly-arbitrary-things or maybe once in a while combined into a coherent thing with a specific use in mind- for instance, you could attach a mace head to some sort of harpoon gun to create a kind of telescoping grappling hook slash punching device, or attach a gun and trigger mechanism to your glove in such a way that punching dudes causes the trigger to depress and the gun to fire, guaranteeing a direct hit from the gun
and if you don't have the appropriate materials or shapes required for your latest invention from the environment, you could commission them from a blacksmith or melt some parts down to create your own shape, then use that
so essentially a roguelike in which the point of the game is to mcgyver your way out of any situation
in essence, a batman roguelike
