Why is it called “Tri Peaks”? Because of the shape of the layout. Cards on the playing field form three triangles superimposed on one another. There is a base card and the supporting deck under them; they look like the legs of peak leaves. Only the cards at the bottom of the triangle and the base are open, the rest are turned face down and blocked by their neighbors. It will be difficult to clear the playing field from the cards, but it is doable.
Another variant of this solitaire name is the “Three Towers”.
How to play
You have to find the card, the numerical value of which is one point more or less than the base card value. Even at the beginning of the game there can be some of such cards, as well as none.
If there is a relevant card, transfer it to the base with the left mouse button, looking for the next sequence number for this card. If there is no relevant card (it is hidden or locked), click on the stock and close the base card with the supporting one. The search continues. Now look for a new neighbor card for the one on the base.
There is no timer in the game. Scoring depends on the value of the card removed to the base and its position in the layout. The higher you move to the tops of the three peaks of card, the more points you get.