Dishonored 2

Dishonored 2's level design is simply among the best the immersive-sim genre has ever produced. A Crack in the Slab, which lets you shift between two versions of the same mansion in different eras to solve puzzles and stage assassinations, and the shape-shifting Clockwork Mansion, both stand as genre landmarks that game design courses will study for years. What elevates it beyond a tech demo is how thoroughly every mission supports genuinely different playstyles, full lethal chaos, invisible ghost runs, chain-possession puzzle solving, and the chaos system that quietly reshapes the narrative and ending based on your body count gives restraint real consequence rather than just a scoring bonus. Emily's telekinesis-adjacent powers versus Corvo's returning kit give real reason to replay the campaign from both perspectives. Karnaca itself, sun-bleached and whale-oil powered, is a gorgeous, believable alternative to Dunwall's grime. The main weakness at launch was PC performance, since patched but still occasionally rough on certain configurations. Even years later, few games offer this much true player agency in how a mission can be solved.