An eerie sci-fi, first person, physics puzzle game, Portal is the spin-off series to Half-Life taking place in the same universe.
Taking place in Aperture Science laboratories -the Enrichment Center- you are a test subject awakened from suspension state for testing purposes. You are given the Aperture Science Handheld Portal Device to take place in the physics experiment, though the plot unravels to reveal a darker truth to the facilities.
Playing Portal on the first time can be admittedly disorienting, but the player progressively adapts to the puzzling nature of the portals and the Device throughout the test chambers. Dealing with test elements such as moving platforms, high-energy pellets, AI turrets and acid pits, each chamber is challenging in its own manner.
You can also try the extra challenges in the game for bragging rights and achievements.
While relatively shallow, the plot of the original Portal game has a certain degree of paranoia fuel and space for imagination of what's manipulating the experiment and the nature of the Enrichment Center. Combined with the ARG and further content ('Lab Rat' comic, among others), the game lore is carried forward and somewhat explained of how it fits within the Half-Life universe, leading into the events of the sequel.
Decent level of detail for a puzzle game, and low performance required make this game worth a try for even older machines.
The soundtrack of Kelly Bailey, composer of the Half-Life series has the uncanny feeling of both sinister, outworldish experience that Aperture Science becomes to the player, helping the immersion into the strange world of Aperture.
The sound effects in the game are fitting to the setting, mainly consisting of sci-fi noises and mechanical machinery. Few audio errors are noticeable if any.
TL;DR: A strange puzzle game that proves a challenging experience eventually brings you deeper into the lore of Aperture Science, a fairly enjoyable game with a great sequel and setting.