Forty and Eight stretched into a 7-by-7 grid of 49 cards, no suit rule on the way down, and just a 1% chance of winning.

Forty-Nine Solitaire takes the Forty and Eight Solitaire formula and stretches it into a seven-by-seven tableau: 49 cards, two decks, and no suit restriction when you build down. It's brutal, with just a 1% chance of winning, so how well you do here depends on skill and luck in about equal measure.
Interchange Solitaire plays by similar rules, and so do Unlimited, Breakwater, and the classics Ninety-Nine and Crossroads.
Solitaire is the root this whole family grew from, if you want to see where it began.
If you run into anything odd or have an idea that would make the game better, please contact me.
Enjoy yourself!
8 foundation piles: Build up from Ace to King in the same suit.
7 tableau piles: Build down regardless of suit. Only single cards move; there's no sliding a sequence into an empty column. Any card can fill an empty pile. Each pile starts with 7 cards, all face-up.
Stock: Click to deal one card at a time to the waste. There are no redeals.
Waste: The top card is always available to play to the foundations or tableau.
There are eight foundation piles.
Any ace can start a foundation pile — the piles aren't tied to a particular suit.
A card joins a foundation pile only if it's one rank higher than the pile's current top card and matches its suit. So the only card that can land on a 10 of spades is the jack of spades. Each pile tops out at 13 cards.
The top card of each foundation can be moved back into play if another pile will accept it.
Seven tableau piles hold seven cards each, all dealt face-up.
A card can be added to a tableau pile only if it's one rank lower than the pile's current top card; suit doesn't matter. So any four can land on a five, regardless of suit.
Any tableau card left uncovered is free to move to a foundation or another tableau pile. Any card can fill an empty slot in the tableau.
You can only move one card at a time. There's no super-move option here; sequences never shift as a group, no matter how many empty columns you have.
There's one waste pile; the rest of the deck makes up the stock.
Click the stock and one card moves to the waste. You get just one pass through the deck, so there are no redeals.
The top card of the waste can be played to the tableau or a foundation.