As intriguing as it might be, Cosmo does not refer to the sugary-sweet beverage beloved by the chic set (escape from the $10 cocktails?). Instead, our solar system is the "star" of the show; time to bust out that 3rd grade astronomy, yes?
Actually, the only real skills you'll need on this adventure are in the realm of pointing and clicking. Cosmo, from the excellent Mydia (who is also, incidentally, the creator of Room W&R), is a lovely escape game that does nearly everything right; the graphics are good, the puzzles varied and inventive, the interface clean and user-friendly. Aside from one or two of the dreaded quasi-unreasonable "leaps" of logic that tend to plague even the best escape games, Cosmo is easily one of the better room escapes to come along recently.
No backstory, not even a few confused words from the protagonist; with no explanation, Cosmo deposits you into a room filled with odd objects and devices. Strange diagrams, a video screen, a spread of brightly-colored glass dolphins…such a curious place! Of course, this room was not designed for any practical purpose. You'll need to collect items, put together puzzles and explore all facets of the room to get out. All the usual room escape goodness. Nothing really new here, but that's okay; why mess with a good thing?
Ok, I sort of lied at the beginning of the review; completing Cosmo does take just a smidgen of comprehension of mathematics and astronomy. It's very likely, however, that Google can easily provide the information you require. While I know that some prefer that escape games exist as self-contained units, able to be finished without any outside information, I personally like when developers integrate a bit of the external world into their creations (provided that the information required isn't too esoteric, of course). Doing so greatly increases the material available to the developer, thereby leading to enhanced creativity and ultimately a richer genre.
Note: Cosmo may take a while to load and does not have a loading bar on-screen, so don't fret if it seems that the game is frozen. It should load eventually.