No card ever builds on another here: two lone cells are all the breathing room you get, chasing a 35% win rate to the foundations.

Stalactites Solitaire strips the tableau down to nothing: no card can ever be built onto another there, so the two cells are the only breathing room you get while you feed cards up to the foundations. You'll win roughly 35% of the time here, a medium result for a tableau this bare. It's played with a single deck, and your odds of victory come down mostly to skill and luck.
Other solitaire games like Limestone, Stalagmites, and FreeCell are comparable to this one.
For a change of pace, original Solitaire is sitting right there whenever you want it.
If you run into anything odd or have an idea that would make the game better, please contact me.
Enjoy the game!
4 foundation piles: Build up from the rank of the first card dealt to each pile, regardless of suit, wrapping from King to Ace as needed, until each pile has 13 cards. Each pile is given a card at the start of the game.
2 cells: Each cell holds one card. The card may only be used on the foundations.
8 tableau piles: No construction is permitted on the 8 tableau piles. The top card can be played on the foundations or cells. Only one card can be moved at a time. Once a pile is emptied, it stays empty. At the start of the game, each pile is given 6 cards.
There are four foundation piles.
A card can be added to a foundation pile 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. There can be no more than 13 cards in a pile.
The top card of each foundation can be moved back into play if another pile will accept it.
Two cells, all of which are originally empty
One card can be stored in each cell. Any available card can be played into any available cell. Cell cards can only be played to the foundation.
Eight tableau piles of six cards each, all dealt face-up.
On the tableau, no construction is authorized.
Cards on the tableau that are not covered by another card can be played onto the foundation or an empty cell.
The tableau's empty spaces may not be filled.