Split your tableau in half: alternating-color FreeCell piles with parking cells on the left, same-suit Scorpion runs on the right, and a 95% win rate.

Antares Solitaire splits the tableau right down the middle. The four piles on the left play by FreeCell rules: alternating color, one card at a time, with four cells for parking. The four piles on the right play by Scorpion Solitaire rules: built in suit, with whole face-up runs draggable as a group regardless of order. Cards can cross from one half to the other whenever the receiving side's own rules will take them.
Thomas Warfield created Antares. The game is simple, with a 95% chance of winning, and skill matters far more than luck here. It's played with a single deck.
FreeCell Solitaire, Demons and Thieves Solitaire, and Shaula are also worth trying if you like this Scorpion-and-FreeCell mashup.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have fun!
4 foundation piles: Build up from Ace to King in the same suit.
4 cells: Card storage spots. Each cell holds one card.
8 tableau piles: Four FreeCell piles on the left build down by alternating color, one card at a time, and start with 7 cards each. Four Scorpion piles on the right build down in suit, move as groups, and start with 6 cards each.
There are four foundation piles.
Any ace can be placed on an empty foundation pile.
A card can be added to a foundation pile only if it's one rank higher and the same suit as the pile's current top card, so the only card that fits on a 10 of hearts is a J of hearts.
The top card of each foundation can be moved back into play if another pile will accept it.
There are four cells, and all four start empty.
Any available card can be played into any open cell, one card per cell. Cell cards can be played back to the tableau or the foundation.
The tableau is split into two halves of four piles each, all dealt face-up.
The left half plays by FreeCell rules: cards build down by alternating color, and only the top card of a pile can be moved (use the cells to shuffle more than one at a time). Any card can fill an empty pile on this side.
The right half plays by Scorpion rules: cards build down in the same suit, and any face-up run, whether or not it's in order, can be dragged to another pile as a group. Only a King, or a run headed by a King, can fill an empty pile on this side.
A card, or a legal run, can move from one half to the other whenever the pile receiving it will accept the top card.