Numberama is the good old puzzle and probably the best time killer, that was played in copybooks in universities and colleges at the 80-90's.
Students love it cause it's a perfect time-killer and it never get bored. You can play this game for hours untill you want to eat or sleep. Numberama looks a little bit hard for newbies, but the funniest thing is you can solve it in a couple minutes if you will think in two steps forward.
Customer reviews:
'Made my brain work again'
'Way better than sudoku'
'Fantastic game! It's a real Zen!'
'I've played it all the night till 8 a.m. Told my sister to download it and looks like I lose her

Amazing game!'
Get it for FREE till the end of weekend
Youtube video: Impossible is possible. Numberama win - YouTube
iTunes link: App Store - Numberama
Price: FREE till November 20th.