What is Lexica?
Lexica is a puzzle game where you have a set number of letters that each slide in one direction from a side of a crossword puzzle like box into the fields designated for them. So the letters to the left and right will only fit into the rank they are at, while the letters to the top and bottom will only fit into the file they are at.
The difficulty in the game stems entirely from trying to find out what words you need to create. Since the game has three difficulties and is entirely in English, a good knowledge of English language is recommended to play this, otherwise you will spend a lot of time trying to figure out words since usually there would be several ways to fit all letters into all places, but only one where all designated ranks and files will contain English words.
There is a total of 96 puzzles, divided into eight "puzzle packs", per difficulty - easy, intermediate and hard -, making a total of 288 puzzles in 36 packs. Since the only requirement for achievements is to complete all puzzles, 100p are definitely possible for everyone, although they will go a lot faster if he knows English language well and has a bit of geometrical thinking.
The sound is nothing special, I usually have it off and music playing instead. The graphics are good enough, as you can see on the official screenshots. Overall the gameplay is the only selling point of this. For me, at a good but not perfect English level, the harder levels seem crazy at first view, but the easy ones are fine.
The one thing that I really dislike is that only certain letters are used for achievements. Here I would have liked to have 26 achievements with one letter for each one, like in Lyne where you eventually can use them to spell out words on your Steam profile (achievement showcase).
For linguistic puzzle fans
(Note that at the time of writing this review, on 14 December 2014, the game is 90p off, at this price you definitely should get it!)