This is what I call a perfectly executed puzzle game.
Ok, I don't get why this game has the title it has, as it does not have stealth (But puzzles involving remaining hidden) and there's no "b4stard" in the game (At least the main character isn't). It seems that the "DeLuxe" part is due this game being first developed as a free game. It also seems that it can't be "b4stards" in the review text, so sorry for the 4.
Anyway, title shenanigans aside, we have our little lovely clone, in the standard-post-aperture testing chambers, trying to get from A to B, where "B" is a closed door which usually has to be opened by "hacking" (Going to the terminal and press "B" for a small amount of time) some computers in points C,D, etc etc.
Here the meat and bones are in how is and what is in the path from point Whatever to point Wherever. And here is when Stealth B4stard DeLuxe shines.
There are several "worlds". Each world introduces a new mechanic (be it portals, platforms that move in a specific moment, new sentries that hunt you down in different ways...) and mix it with previously seen mechanics, adding new stuff just when you were starting to get tired of the old stuff and mixing it to get new original combinations. And it works, and its fun: There are maps in which you have to think, maps in which you have to be quick, maps in which you have to be smart and know where to crouch, maps in which you have to have iron reflexes... you have to pull boxes, to crouch behind turrets, to make NPC's work for you by moving parts of the map, to jump and crouch everywhere in the right moment to get the desired output... there's a lot of things to do and, as I said, there's always something new to add to the bag of tricks the game has each few maps. And also find the secret DNA sequences.
For better or worse, though, the difficulty of the puzzles isn't exactly top tier. I had to stop to think several times (After getting killed over and over in the same spot), and more times I got killed because I didn't jumped in the right moment, but still I hadn't to scratch my head a lot to go through the standard game. The game's easy, but not "The Ball" or "Portal 2" easy, just a bit less, enough to make it a decent light after work challenge. (And most of the DNA sequences are really well hidden).
But you will die. Lot of times. And you will even get angry at the game. And that's great, as you will not die too many times and the reason for your demise will be, almost always, your fault.
It also has standard issue scoreboards (Finish the level in the shorter time), some extra items to help you move for an already solved test chamber, and an editor with lots of communitty made maps that most of us will never use, but hey, is good to know it exists and maybe tomorrow I'll give a try to the editor.
In short, a great, fun, balanced and very well designed small puzzle game. Worth it.