Tips for level 340 Candy Crush Saga
You have 30 moves to clear the jelly, which is locked in marmalade in the bottom half of the board.
You need vertical stripes and strip/wrap combos to clear the marmalade and jelly.
There are 3 stripes provided in the centre which if switched together will clear 2 rows of jelly or marmalade on each side BUT as soon as you use them bombs will drop with a count of only 5 moves.
My advice would be to clear as much jelly as possible without using those stripes and within the last 5 moves switch them, or if you know they will clear the last of your jelly.
Once the bombs are released it will be difficult, if not impossible to destroy them before they count down to zero.