The "Etrian Oddysey" series for DS...
God these games. Even right at the beginnging the enemies can nearly 1 shot your chars, not only that the common enemy usually got abilities to poison/confuse/entangle etc you from the start on.
Shortly later you get unavoidable terrain damages too, Super monsters chasing you around, traps, tricky risik vs reward situations. On top of that you cant simply buy new equipment or unlock it by leveling up, you gotta collect specific materials from mobs which drop these under only specific cirumstances, which you give to the shopkeeper and then buy it for a hefty price and its hard to get money since theres no free HP/MP regen anywhere and you barely gain enough money to heal up your chars. T__T
Im only progessing in one of these games because in one is a exploit where you can grind for money with near to no risik.
Oh and did i mention, if your entire party dies your progess is lost to where you last saved? Guess what, you cant save anywhere in the maze.