Labyrinth is the simplest form of a genre of solitaire games called Blockades.
There are four foundations that start with aces already in place.
Foundations can be built up in value, ace to king, in the same suit.
You start with 8 cards in the tableau.
You can move cards from the tableau to the foundations.
Removing a card from this first tableau row will result in that space being immediately filled by a new card from the stock.
After playing all the possible moves you see from the first row to the foundations, click the stock to deal a second row. From this moment on, cards will not be used from the stock to fill empty spaces.
You can now move cards from the first and second rows to the foundations.
When you have no more moves, click the stock again to deal a third row.
When there are more than two rows in the tableau, you can only play cards that have either a blank spot above or below them. So cards on the second row will not be playable if they have a card directly above and below. But that same card will become playable if you remove one of those two cards later on.
Continue to play, adding new rows of 8 cards as needed to the bottom.