TriPeaks, rules and strategy
A solitaire game with three peaks: 28 cards, of which only the 10 at the bottom are face up at the start, a waste pile and a stock. A card is removed when its rank is one step above or below the waste card's rank. This site explains the exact rules, strategy and games verified card by card. To play: TriPeaks Solitaire, on iPhone, iPad and Android.
Available on the App Store and on Google Play.

TriPeaks at a glance
TriPeaks is a single-player game using a deck of 52 cards. 28 cards form three peaks side by side across 4 rows. Only the 10 cards in the bottom row are face up; the other 18 are face down. One card goes onto the waste pile; the other 23 form the stock.
A face-up card with no cards covering it can be removed if its rank is exactly one above or below the waste card, regardless of suit: a 5 or a 7 can go on a 6. It becomes the new waste card, and the cards it covered turn face up once they are uncovered. When no card is one rank above or below the waste card, draw from the stock. You win by clearing all three peaks. The app starts at 500 points, deducts 1 point per move and adds 100 for each peak cleared: 772 at best. The rules explain each move in detail, while the strategy explains how to approach the game.
A deal from the app
Here is the deal with code TP1-E-AAAAAAB as dealt by the app. With the A♣ on the waste pile, 3 cards in the bottom row are playable under Easy rules: R♣, 2♦, R♦. Paste this code into the New Game window to play it; a game won in 50 moves is detailed on the Examples page.
Stock: 23 cards; waste pile: ace of clubs. Peaks: face-down card, face-down card, face-down card; row 2: face-down card, face-down card, face-down card, face-down card, face-down card, face-down card; row 3: face-down card, face-down card, face-down card, face-down card, face-down card, face-down card, face-down card, face-down card, face-down card; bottom row: 3 of spades, 5 of spades, king of clubs, 4 of spades, 2 of diamonds, ace of spades, king of diamonds, 8 of hearts, 7 of clubs, 9 of spades.
Where to start?
The rules
The three peaks, face-down cards turning over, one rank higher or lower, the stock, king and ace, scoring.
Strategy
Reveal face-down cards, count before drawing, preserve sequences, aim to clear peaks.
Verified games
Actual deals from the app with their codes, including a game won in 50 moves, replayed move by move.
Frequently asked questions
Is every deal winnable? Easy or Classic? How can you score more? Short answers.
On phone and tablet
The app is played in landscape orientation. It offers Easy rules by default or Classic rules, a code for each game to replay or share a deal, the ability to undo the last 100 actions, statistics and 36 languages.

