Loop one wrap-around foundation from Ace to King and back to Ace again, then bend all thirteen tableau piles the same way. Medium difficulty, a 40% win rate, and it's mostly skill.

A single foundation pile climbs from Ace to King regardless of suit, then wraps back to Ace and climbs again, until it holds all 52 cards. The tableau builds the same way, up or down and wrapping King to Ace as needed, which gives you far more escape routes than a strict foundation-only game would. It's medium difficulty, with a 40% chance of winning, played with a single deck, and your result comes down mostly to skill.
Four Leaf Clovers Solitaire plays much like Black Hole Solitaire and All in a Row Solitaire, which share the same single, wrap-around foundation.
If you run into anything odd or have an idea that would make the game better, please contact me.
Have a good time playing!
1 foundation pile: Build up from Ace to King, regardless of suit, wrapping from King to Ace until the pile contains all 52 cards.
13 tableau piles: Build up or down regardless of suit, wrapping from King to Ace or Ace to King as needed. Only one card moves at a time, and once a pile empties it stays empty. At the start of the game, each pile is given four cards.
There is one foundation pile.
A card can be added to the foundation only if it's one rank higher than the pile's current top card, regardless of suit, so the only card that fits on a 5 is a 6. The pile wraps, so an Ace can be played on a King, and once a full Ace-to-King run is complete, another Ace starts the cycle again.
The top card of the foundation can be moved back into play if another pile will accept it.
Thirteen tableau piles of four cards each, all dealt face-up.
A card can be added to a tableau pile only if it's one rank higher or one rank lower than the pile's current top card, regardless of suit, so the cards that fit on a 6 are a 5 or a 7. The tableau wraps too, so a King can go on an Ace and an Ace on a King.
Cards on the tableau that are not covered by another card can be played onto the foundation or any non-empty tableau pile.
Once a tableau pile is empty, it stays empty; nothing can be moved into it.
Only one card moves at a time; sequences are not permitted.