Solitaire Gaps is an interesting variation of solitaire.

Arrange the cards of every suit in ascending order from left to right.
The last space in each row should be empty.

You can move a card to a gap if the card has the same suit and the next higher rank of the card
at the left side of the gap or the card is one of the 4 lowest cards
and the gap is at the left side of the playing area.

Good luck!