I think you can just play Qa3# and also if you promote to a queen its doublecheck and mate i guess.
Many mentioned pawn promotion for the original puzzle. It is wrong answer. That pawn is pinned to King. It can't move.
Ng6 is also wrong. There is Bishop at b1 to take it.
I went through literally every other possible check before I saw it, sadkek. There are 20 other checks in total.
