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Hi @toni_bec @cazza7
Level 7846 is a really hard one!
Use the paint when you can - to make the X2 blocks it needs (any color X2 is acceptable for this level)
Also, remove large groups of blocks as this seems to make more locked blocks fall (which you also need to collect)
Don't bother wasting moves by using your key booster as enough fall within the game to unlock the locked blocks.
Here is an example, I hope it helps? ๐