I play a few video games so I'll throw in my two cents
Something dealing with the hardening/tempering process for weapons could be done very neatly in a game.
Once steel is hardened it has to be tempered to the desired hardness and on steel this can be observed through the running of colors (like a rainbow)
Maybe an element of the game could involve having to quench the weapon at a certain point in the running of colors upon the item. The more accurate the quench time, the better the weapon.
Perhaps different materials flow the colors quicker or slower, perhaps some secrets in the game could involve quenching certain weapon at certain colors to get special abilities.
I'm sure one of the more experienced guys around here will correct me if I made and errors in trying to explain this process.