Strip Spider Solitaire down to one deck with no stock, build down regardless of suit, and bank on skill for a friendly 95% win rate.

Simple Simon Solitaire is Spider Solitaire boiled down to a single deck with no stock. All 52 cards are dealt face-up into a lopsided staircase of ten piles — the first three hold eight cards each, and every pile after that holds one card fewer, down to a single card on the last. Named after the simpleton of the nursery rhyme, the game rose to fame through computer solitaire collections, where it became a favorite warm-up for Spider players.
Don't let the name tempt you into playing carelessly. With no stock to bail you out, every deal is an open puzzle: you build down regardless of suit, but only same-suit runs move together, and only complete King-to-Ace suites leave the tableau. It's played with a single deck and has about a 95% chance of winning, and skill decides the outcome far more than luck does.
Scorpion Solitaire and Chinese Spider Solitaire take Simple Simon's build-down-regardless-of-suit idea and each bend it a different way.
You already know where this one came from: Spider Solitaire is the full ten-column version, stock and all.
If you run into anything odd or have an idea that would make the game better, please contact me.
Enjoy playing!
4 foundation piles: Each one receives a complete sequence of thirteen cards of the same suit, from King down to Ace.
10 tableau piles: Build down regardless of suit. Groups of cards in descending order and of the same suit can be moved together. The first three piles are dealt 8 cards each, then 7, 6, 5, 4, 3, 2, and 1 in the remaining piles, all face-up. There is no stock.
There are four foundation piles.
Single cards are never allowed to be moved to the foundation. Only once you've built a complete sequence on the tableau, thirteen cards of one suit in order from King down to Ace, can you transfer it to a foundation pile.
Cards cannot be taken from the foundation after they have been placed.
Ten tableau piles, dealt in a downward cascade. The first three piles hold eight cards each, and each pile after that holds one card fewer than the pile before it, ending with a single card. Every card is 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, regardless of suit, so the cards that fit on the 7 of spades are the 6 of spades, the 6 of hearts, the 6 of diamonds, or the 6 of clubs.
Groups of cards in sequence down from high to low may be moved from one tableau column to another if all cards in the group are of the same suit.
Any card or movable group of cards can fill an empty slot in the tableau.