There are plenty of things in video games that do not make sense. But we gamers have such a strong suspense of disbelief that we generally overlook such things in order to enjoy the game. But alright, I'll play along:
- Why are hearts in Castlevania used as ammunition or currency? I mean, it doesn't make much sense for hearts to be health, but it makes even less sense for them to be ammunition or currency.
- Why do medpacks/painkillers in shooter games instantly recover health? Health kits are merely used for bandaging them and painkillers don't even treat wounds.
- While we are on the subject, how can characters in first-person shooters regenerate health so quickly? It takes days, if not weeks, for wounds to heal.
- Why are ruins and dungeons in fantasy games always filled with treasure? More often then not, you would more likely find objects from every day use rather then gold or jewellery. Infact, the longer a ruin has existed, the more likely it is someone had thoroughly plundered it long ago. Unless they are filled with hostile monsters...
- ...which brings me to another question. Why are there always hostile monsters in ruins and dungeons? Surely not every ruin contains something worth defending from intruders and that is even less likely with dungeons. And even if there is, why would they attack everyone on sight? It's not like everyone knows that those ruins or dungeon might contain.
- Why do random wolves, bears and other natural creatures attack you and even cooperate against you? They don't instantly have a reason to fight you and some of them might even be predators to the other.
- How can characters in most shooters carry so many weapons? Surely not all of them went to the Dungeons & Dragons dimension to borrow a Bottomless Bag or have access to Hammerspace.
- How can transformable mecha be faster and stronger then regular jet fighters? Fighter aircraft are usually more aerodynamically designed, so they should be able to beat half-fighters most of the time.
- Speaking of mecha, why are they usually so large? They practically beg to be shot in the legs and be quickly rendered inoperative.
I could go on and on, but I think you get the picture by now.