Around the World in 80 Days

Help!!!!!! I can get to level 78 and then cannot beat that one. I have tried so many times I am ready to stop playing the game. The bottom section is all locks and I can't figure out how to unlock them. There is not enough time to use the hammer or bombs to release them. I want to be able to finish it and am getting very frustrated. Please advise me as to what is the trick for releasing the bottom section on level 78. thank you

I am stuck on level 58. How do I get the locked tiles wo crack after matching colour this wont work - also the idols are at the bottom wont drop down how is this done without using hammer?

Thanks for all your advise
Jeanette