You can break two blocks at once in Glass Tower World. Just tap two blocks simultaneously.

The game has been totally rewritten! Biggest update ever!

• better physics and really big performance improvements
  
• new levels (total amount is now 327)
  
• new amazing icon 
  
• much better Facebook connectivity and friends invitations
  
• new options added (Facebook logout, sound controls)
  
• free coins and ability to collect coins even on completed levels
  
• fixed all known bugs

And all of these features are still free to play and free to win!