Domino Peak is a free digital dominoes application available for iPhone, Android, and web browsers. It allows users to play dominoes online in real time against other players or offline against computer opponents. The app offers two primary game modes: Classic 101, a race to 101 points played across multiple rounds, and Telefon 365, a four-way variant where the first closed double opens four directions and scoring occurs when open ends total a multiple of five, with 35 points resulting in an instant knockout. The game uses a standard double-six set of 28 tiles. The application includes several gameplay features. Users can play against artificial intelligence at three difficulty levels (Easy, Medium, Hard) that support Telefon multi-tile combinations. A pass and play mode allows two to four players on a single device, with team play available for four players (A and C versus B and D). Online play includes Quick Match for automatic seating, private rooms with invite codes, and the ability to reconnect after a dropped connection. Live voice chat, text chat, and emoji reactions are integrated at the table. Global leaderboards track weekly, monthly, and all-time rankings for each mode. The interface displays ivory tiles on woven felt with walnut rails and brass trim, accompanied by smooth tile animations, sound effects, and haptic feedback. Typical use workflows involve either launching a game against bots for offline practice, starting a pass and play session with others on the same device, or joining an online match. Online users can select Quick Match for immediate placement or create a private room and share an invite code for a scheduled game. Players can start as a guest without signing up, or they can sign in with Google or Apple to synchronize stats and appear on leaderboards. The app automatically fills empty seats with bots if matchmaking takes time. Gameplay proceeds by drawing a hand, matching tiles to open ends of the chain, drawing from the boneyard when stuck, and aiming to empty one’s hand or hold the fewest pips when the board blocks to win a round. Domino Peak is available in eleven languages, including English, Azerbaijani, and Turkish. The full game functions offline without an internet connection, retaining match history and bot play. The application requires no signup to start playing and is free to use across supported platforms.