Baba Is You: This game allows players to manipulate the rules of the game itself, leading to incredibly complex and mind-bending solutions
The Witness: Featuring hundreds of environmental puzzles on a mysterious island, its abstract logic and hidden mechanics require immense deduction
SpaceChem: A Zachtronics game, it demands players design and optimize complex chemical reactions with intricate automation, taxing spatial reasoning
Stephen's Sausage Roll: Deceptively simple in appearance, this 3D puzzle game features incredibly tough block-pushing mechanics and spatial awareness challenges
Myst (and Riven): These pioneering adventure games are renowned for their obtuse puzzles and reliance on meticulous note-taking and exploration
Snakebird: A seemingly cute platform-puzzler, its later levels present brutal challenges involving body manipulation and precise movement
The Talos Principle: A philosophical first-person puzzle game, it combines Portal-like mechanics with increasingly complex and interwoven logical challenges
Deadly Rooms of Death (DROD): This long-running series features tile-based dungeon crawling with deep tactical puzzles that demand foresight
Return of the Obra Dinn: A unique deduction puzzle where players must piece together a narrative and identify fates through careful observation and logic