Does anyone know the solution?

i have spent twenty minutes on this puzzle and cannot find the solution...help is urgently needed, lichess community!!!

lichess.org/training/61311

Cxf6+ man, firstly look for forced moves

In puzzle rush I would have taken instantly the Nf6.

I found in 10 seconds

I found in 2 seconds because i did it before!

There's a Queen check square at d5, how can you utilize it?