The Connection is a first-person puzzle game set in a strange world of colorless cubes. Connect all the loose ends of three-dimentional puzzles to open up gates and travel further into the chaotic landscape. The length of the game varies greatly depending on how good you are at puzzle solving, I'd say an hour at max. Speedrunning is very possible, however you'll enjoy the game much more if you take your time and explore. The game was made in a week for Game Jolt's Chaos contest.
This is a very nice first person puzzler. In an abstract black, white and grey cuboid world (see pictures), you'll solve many 3D puzzles. There are all of the same kind: You have to rotate small pieces arranged in a 3-dimensional grid so they connect to each other. They start "simple" with a 2x2x2 grid (a cube), but will become bigger over time.
Each puzzle will open a force field blocking your way, so you can continue exploring the world after you solved that puzzle. After the first puzzle, the world will split up into different paths (but not so many that you loose track).
There are also a few additional puzzles (of the same kind, with white pieces) that don't open a force field. I'm not sure if they are optional or provide another effect that I couldn't determine.
At the end of the game, once you've reached the game's destination, you are given a nice little experience for your effort.
Summary: If you are into abstract puzzles and not afraid of 3D, give this game a try.