All you need to do is have similar tiles toouch each other, and they will dissapear. Clear the level, and move on to the next. Trust me, it's simple - and I should know, I programmed it for Symbian!
Nguyen's version of the open source game is functional at best, and a lot more could be added to make this feel a comprehensive game, but until there's an update or a competitor, this has made me very happy. And frustrated. And I apologise for the time you'll spend on level 34 in advance.