I don't get why my move was wrong in this puzzle

https://www.chess.com/puzzles/problem/677854

Why can't I just move the queen to A8? Am I stupid or is this puzzle wrong?

Yes, but why can't I just mate in 1 with the queen? The king doesn't have anywhere to move

Oh yea that makes sense thanks. I guess I am stupid after all lol

I think something isn't right. There is no mate in two, at least in the puzzle I'm seeing. Queen to a8 seems to be the best move. The king escapes and the game drags on but white has an advantage.

I've checked with the computer. Qa8 is the best move. I think there's a problem with the puzzle.

whats wrong with Nd6 -> Qb7

This is the solution to the puzzle. 1. Nd6+ Kb8 2. Qb7++

Plus, the "mate in 2" was only a suggested theme, and not necessarily the whole point of the puzzle. I've added the Pin theme to this puzzle. Also, the browser engine for chess.com suggests the above mentioned line as mate in 2. Qa8 only yields +0.10.

I think you did the same error that as i did. I assumed that the puzzle started from the position that was on the board when i open the link and that the king was on e8. Instead, its probably blacks turn to move and black does a 0-0-0. Then it is a mate in 2 puzzle.

u guys stupids check with the knight

then mate

I dont know. It says white to move from the position given. It doesn't say black to move. It's certainly not a mate in two from the position given. 

The way the chess.com puzzle works is that it starts with your opponent making a move. I tried it in this puzzle (https://www.chess.com/puzzles/problem/774708) where the black rook starts on e5 and if you try to solve it, black will go Rxd5 and it is after that position you have to solve the puzzle. I cannot open the spesific puzzle in the opening post, but 0-0-0 makes sense based on the other answers.