Nurikabe Vault is great new brain teaser logic game, in which you use logic to solve puzzles (500 of them are included!). The user interface is a bit quirky but in a fun sort of way using dials to select the puzzle you wish to tackle. Scoring is based on the time it takes you to complete a puzzle and I can tell you that once you start one it's hard to stop. This is a perfect game when you need a the 5 minute break or mental diversion, you could probably solve a handful of the easier puzzles in that time, larger ones might take you longer. I love that there are so many puzzles included, going to take me some time to finish them all haha! The inclusion of Open Feint is pretty neat should you wish to see how your times compare to others or to issue challenges (though I haven't tried that aspect yet).
All in all this game delivers a huge number of fun and engaging puzzles, it's going to see a lot of use on my iPhone.
Show less