There are games you pick up and play. And then, there are games that you cannot put down. Glass Tower 2 seems to be one of the latter.

Glass Tower 2 is not a new title, originally getting a 2010 release. But it's recently taken the top spot on Apple's Free App charts, surpassing the likes of Angry Birds and is thus worth a look. I quite like Glass Tower 2 — it's an engaging puzzler that makes perfect use of the iPhone's interface.

The only downside is that the first fifteen levels are free, but to continue, players will need to shell out for "level packs" which are US$0.99 a pop. So far, the free levels seem to be captivating enough to prevent me from ponying up the cash for more Glass Tower 2.