Recent reviews by Oli

Good game for it's price.
Stealth is enjoyable with friends and it has a nice skills and perks system
This game is pretty hard to get into however. The game is pretty unforgiving when talking about rewards. If you fail a mission you get nothing, for maybe 20 minutes of work.
But when you finally complete a mission, particularly stealth mission, it's really satisfying.

Overall, 8/10

This game has a lot of replay-ability, which for me makes a game worth it if is it fun enough. It is!

Don't get me wrong, i really enjoyed playing this game.
The Concept is great, the game guides you through the different difficulties with the right curve and the controls are intuitive.
The only problem with this game is how long (or short) it is. I have played through the entire game in 75 minutes without too much trouble.
Others have said some puzzles are unsolvable without guessing, but this is not true. All puzzles are solvable.
If you like the concept and really want to play this game: DONT buy this game. buy hexcells infinite instead. I dont have that game but the replayability seems far greater.

TLDR; Buy Hexcells infinite