Sim City on your mobile.
Main idea is to stack blocks directly ontop of each other, the more you do the better the multipler gets and the more bonus you get. If you are slightly out the multiple resets. There are blue,red,green and yellow towers that give you progressively more population. If you build you tower well ( about 5% error) you'll gain a prize tower top that give you a mega bonus. Your main aim is to gain 19000 population, although I've only managed around 11,000 so placing you towers is paramount. But you just can't place them anywhere. Each larger tower requires a neighbour of 1 to3 of the other coloured towers, so you quickly have to knock down others to progress. With a lastability of 20-30 minutes before switching off, I suggest to build and then come back to the game before you throw you mobile.
Sound is just a single tune that can be turned on or off, and the graphics, well pretty basic, but this game is all about skill.