Any Dragon Quest game, especially 1-4 and 8. The whole process is just
>grind
>reach a new town
>buy more powerful equipment with the money that you earned while grinding levels and from selling the less powerful equipment that you don't need
>explore a dungeon to get some armor pieces or weapons that you can't buy in town shops, iirc there is nothing hidden behind bullshit like random destructible walls
>rinse and repeat
No overly complicated mechanics and the original release of each game is user-friendly even if we are talking about the NES ones