ATTN Harry:
I think I have a foolproof method for getting the $1m in wheel having gotten it yet again today.
Play a game on hard, single player and let it play itself (ie don't touch anything). In the first or second round the self playing wheel spins will sometimes land on the million dollar spot (seems to be once every five or six games). Make sure you guess a good letter to snag the wedge and then tank it until the end. Don't win any puzzles, spin only when you have to and then fail the rest of your turns by attempting to solve and failing.
When you get to the last round prize wheel where you spin to select a card, start mashing the cross button. If it works it should spin right away instead of making you wait for the 'Saving...' thing in the corner. Solve the puzzle. One million dollars.
Granted this has only worked for me three or four times in a row (landed on the spot four times in 25 games), but that seems like a pattern, right?