Sudoko & Kakuro

I have downloaded 2 puzzle games Sudoko & Kakuro into my mobile phone sometimes ago. It cost $6 for each game. I find it quite fun, challenging and entertaining. Usually I play on the phone while on the bus or train. Two week ago while browsing in a book store (PageOne) at Vivo city I saw quite a range of puzzle books available. After some selection, I finally bought “The Everything Kakuro Challenge Book”. It has more than 200 puzzles ranging from mildly challenging to moderately challenging to extremely challenging. I am still at puzzle 15 of the mildly challenging puzzle. My sis bought "Killer and Samurai Sudoku: The Ultimate Challenge with 140 Puzzles (Sudoku)".
We really kana hooked by these books until we take a break from it to complete the Harry Potter book. As compared to the phone, this book is more difficult & challenging. I think this will keep me occupied & entertained for quite some times.