If anyone here has a DS, I seriously recommend getting Castlevania: Order of Ecclesia. As you probably know, i'm a major fan of Demon's Souls, but Ecclesia puts Demon's Soul difficulty to shame most of the times.
Especially if you do the Hard Mode Lvl.1 cap. It's up there in difficulty with Ghouls and Goblins and Battletoads. Made me want to throw the DS out of the window more than a couple of times and almost broke the L and R triggers with all the back-flips, dashing and glyph changing you have to do in a blink of an eye XD
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"