Any decent ones you can recommend? I quite like to while away the hours playing puzzle games.
I like old favourites such as Spider Solitaire and Sudoku.
I have a backgammon app on my tablet. I usually have a couple of games of that a day, though I don't really rate it. It makes a few blunders now and then, and especially when about to lose. Not that it matters when no money is involved, but it annoys me when it overlooks a piece in my home quarter and rushes to get less important pieces to safety in its own home quarter so I backgammon it, when it could have easily only lost a gammon!
I like '2048'. There are lost of free versions available. There is the pressure to achieve a score of 2048, but after that I just relax and see if I can beat my high score.
My absolute favourite puzzle game currently is '
Palisade'. (That link takes you to a web version but native versions are available for Unix, Mac and Windows.) There is a huge collection of other free puzzles on the same site. The version of Minesweeper is interesting because it NEVER blows up on your first move, something which annoys me on the conventional version.
PS The web version of Palisade has started looking a bit odd on my laptop. I don't know if it is a problem on my machine, or whether a bug has been introduced since I first played the game online. I now play it offline on my tablet, which reminds me - there is a free Android app which has ALL of the puzzles in it.