>>11808090 (OP)Dragonstomper ("Full" Console RPG on Atari 2600 in 1982)
Mountain King (Horror Platformer for Atari 2600 from 1983, popularized background music, dynamic music cues based on gameplay)
Tunnel Runner (3D Maze for Atari 2600, looked almost as good as Wizardry/Ultima and had better color)
Star Cruiser (Arsys; fully polygonal RPGFPS in 1988)
Corporation/Cybercop (Core; Cyberpunk RPGFPS with location specific damage in 1990 )
Megami Tensei/Dungeon Master (first dungeon crawlers with full color graphics and texture-mapped walls, developed simultaneously and released the same year) (Megaten for monster battlers/autobattlers) (Dungeon Master for the inventory interface every RPG and Survival Horror game uses to this day)
Drakkhen (Fully 3D open world years before Ultima Underworld/Arena/Daggerfall. 1989)
Virtual Hydlide (seeded worlds, procedural generation, persistent worlds, over the shoulder 3D dungeon crawling perspective 3 years before Zelda:OoT)
Tactics Ogre (invented its own genre)
Daggerfall (first modern open world game and the basis for modern elder scrolls, GTA and basically every sandbox, procedural generation, the same heightmap code Elder Scrolls games still use to this day)
GTA (Much like Elder Scrolls, the whole gameplay loop of the 3D games is already there in 1997 and the game has aged incredibly well if you aren't bad at video games)
King's Field 3 (open-world 3D dungeon crawler with massive overworld and dungeons 3 years before Zelda OoT)
Those are my favorites that come to mind, but I'm probably arbitrarily excluding a lot of stuff. It's worth noting that pretty much all of these games except Mountain King, Megaten/Dungeon Master, Tactics Ogre, Daggerfall and GTA have objectively bad gameplay. And it hurts me to say that for King's Field 3 and Virtual Hydlide because I find them fun, but if you're being objective it's pretty dire. Dragonstomper, Drakkhen, and Cybercop are virtually unplayable. Cybercop is extremely terrible.