Take Arizona's layout and make it meaner: alternate colors down the tableau instead of ignoring suit. Still fair though, with a 50% win rate in one skill-driven deck.

Phoenix Solitaire takes Arizona Solitaire's layout and makes it tougher: instead of building down regardless of suit, you have to alternate colors as you go. It's a medium-difficulty game with a 50% chance of winning, played with a single deck, where skill matters more than luck.
If you enjoy Phoenix, try classic Solitaire, a traditional solitaire card game.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have a good time playing!
4 foundation piles: Build up in suit order from Ace to King.
6 tableau piles: Build down, alternating colors. Cards in sequence by alternating color can be moved as a group. Any card can fill an empty space. Each pile starts with 6 cards.
Reserve: The 16 leftover cards form a single pile, all dealt face-up. Only the top card can be played, to the foundation or tableau.
There are four foundation piles.
Any ace in the foundation may be transferred to any vacant pile.
A card can be added to a foundation pile if it's one rank higher than the pile's top card and the same suit, so the only card that can land on a 9 of clubs is the 10 of clubs.
The top card of each foundation can be moved back into play if another pile will accept it.
The 16 cards left over after the tableau is dealt form a single reserve pile, all face-up.
Only the top card of the reserve can be played, to the tableau or foundation.
Six tableau piles of six cards each, all dealt face-up.
A card can be added to a tableau pile if it's one rank lower than the pile's top card and of the opposite color, so the cards you can play on a 6 of clubs are the 5 of hearts or 5 of diamonds.
Any uncovered tableau card is free to move to the foundation or another tableau pile.
Any card can fill an empty slot in the tableau.
You can move a whole group of cards in sequence from one tableau pile to another, as long as the colors alternate.