Well, here's a list of six games, although two pairs have been put together, for obvious reasons. My honorable mentions are too numerous to list here; if you're interested, check out a list I posted in the video game thread about three years ago
here (sadly, most of the picture links no longer work).
Game titles link to "Let's Play" YouTube playlists. You should be able to skip around and get a sense of each game that way if you want to.
BTW, in case you hadn't noticed, all of these games were developed by either From Software or Capcom, both Japanese developers.
King's Field 2 (1996, PS1) and King's Field: The Ancient City (2002, PS2)
From Software's
King's Field games are the spiritual predecessors to their recent and much more popular
Souls series. These are the oldest games I have that I actually go back and play consistently (once every one or two years). That's pretty impressive considering the oldest of them is coming up on 20 years old now. They have the same sort of feel as the
Souls games, but with at least three major differences -- they have no online or multiplayer of any kind, they are first person instead of third, and the boss fights and combat in general are much simpler and somewhat less interesting (although still engaging, at least for me). Like the
Souls games, the player is thrown alone into a hostile and mysterious land containing many hidden secrets. The games are difficult, and there is no hand-holding. I recall loaning
King's Field 1 to a friend in high school; he returned it a week later and told me that he never even managed to reach the first save point (FWIW, I left
King's Field 1 off my list here because I think the other two are slightly better, but really I love them all). It's hard to convey exactly why these games are so great, but suffice it to say that those who enjoy
Demon's Souls and
Dark Souls would do well to check these out. Unfortunately, they are downloadable PS Classics in Japan for the PS3, but in the US they were never popular enough to be offered as downloadable games for a next-gen system.
Resident Evil 4 (2005, Gamecube)
Resident Evil 4 is so good that the first time I sat down with it, I played it for 11 straight hours without any breaks, even to eat or go to bathroom. That's not something I normally do. It was the video game equivalent of seeing God.Pretty much every aspect of this game is perfect, but the it's even more than the sum of its flawless parts. No wonder it's been ported to so many different platforms. Unlike my other favorite games of all time -- which are mostly niche titles -- this one is mainstream, and if you haven't played it, well... what the hell is wrong with you? Chances are that if a gamer at all, you already have a machine that will play it (including PC). Stop reading this and go play it. Now. Seriously.
Demon's Souls (2009, PS3) and Dark Souls (2011, PS3 and 360)
I didn't include
Dark Souls 2 here simply because it's slightly lacking a certain
je ne sais quoi that the other two seemed to have. But really, they're all great.
Demon's Souls was the reason I bought a PS3 (I already owned a 360), since it was exclusive to that system. I already knew I was going to love it, since From Software's
King's Field games were already among my favorites ever (see above). A playtest at my brother's place just confirmed it, and I bought my PS3 slim on Black Friday 2009. Since then my 360 has mostly gathered dust. In any case, I don't think I need to belabor why the
Souls games are great, since they get a lot of praise on this board already. I'm also really excited for the upcoming
Bloodborne, which is from the same developer and looks very similar.
Monster Hunter 3 Ultimate (2013, 3DS and Wii U)
I bought
Monster Hunter Freedom Unite for the PSP on a lark, just because I wanted something to play on the road while I moved from Chicago to California. Little did I know how good it would be. Monster Hunter can basically be described as "Boss Fight: The Game." It's a third-person action game that has basically done away with all the small chaff enemies that third-person action games normally have. Instead, it's just a series of big monsters to fight, generally with a fifty-minute time limit (not fifteen -- fifty). Killing a monster will let you harvest parts from it that can be used to craft more powerful equipment, which will then allow you to take on more powerful monsters, etc. This is the only series of games for me that might actually beat From Software's
Souls games for best combat mechanics. It speaks volumes that I've played the
Monster Hunter games for hundreds of hours mostly using only one weapon type -- the lance -- when there are about ten other types to choose from, each so different that it's almost like playing a totally different game. I am, of course, much looking forward to the upcoming
Monster Hunter 4, to be released in 2015 for the 3DS.