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Hi @Lynie66
I've found this can happen sometimes in games with vines. I think the vines lock a move just after the game has decided that you can make it. It can be very frustrating.
It could also be because your game needs updating, so check your game store and see if there is an update button.
I'll also give you some tips and an example of how to play Level 4245, it is a really difficult one!
Tips for Level 4542
The a trick to this level is using the line blasters to keep the board moving.
Flowers cannot trap things in their vines unless the object is still for two moves
Pets appear in this level after the one in their column has been freed from the Pet carrier
If you can, use a line blaster to open the carriers in a row.
This way you can open many Pets to drop all together
More importantly though, is getting ALL the balloons down to the final row to break them out at the same time and clear the whole board!
Once you get all the balloons opening the game will almost play it's self
Concentrate on getting the balloons down
The most helpful booster for this level would be more balloon boosters to clear the board and keep things moving
Also the free (earned within the game) mega-bomb could help once you have enough Pets on the board
Good luck!