Spaces Solitaire — sometimes called Gaps or Montana — deals the whole pack into four rows with one gap in each. You move cards into those gaps, and a card can only go into a space if the card to its left is the same suit and one lower in value.
It's a genuinely different puzzle from every stack-based solitaire. There are no piles to build, just a grid to sort, and the constraint means a badly placed card can lock a whole row.
A card can only move into a space if the card immediately to the left of that space is the same suit and exactly one lower in value.
Because nothing is one higher than a king, so no card can legally fill it. Creating those spaces is the main way games are lost.
Yes — the layout is known variously as Gaps, Montana or Spaces depending on the source.