{
  "name": "4D Chess: New Dimension",
  "alternateNames": [
    "Fourfold",
    "TesserMate"
  ],
  "url": "https://tessermate.dastan.chatgpt.site",
  "platforms": [
    "iPhone",
    "iPad"
  ],
  "appStoreURL": "https://apps.apple.com/app/id6814281439",
  "supportEmail": "TesserMate@proton.me",
  "supportURL": "https://tessermate.dastan.chatgpt.site/support/",
  "privacyURL": "https://tessermate.dastan.chatgpt.site/privacy/",
  "documentedFeatureVersion": "0.7",
  "updatedAt": "2026-10-14",
  "releaseVerification": {
    "version": "0.7",
    "storefront": "US",
    "date": "2026-10-14",
    "releaseDate": "2026-10-14",
    "source": "https://apps.apple.com/app/id6814281439",
    "regionalAvailabilityMayDiffer": true
  },
  "languages": [
    "en",
    "uk",
    "es",
    "fr",
    "de",
    "pt-BR",
    "ja",
    "zh-Hans"
  ],
  "features": {
    "offline": true,
    "sameDevice": true,
    "online": true,
    "offlineAccountRequired": false,
    "onlineAccountRequired": true,
    "guestSignIn": true,
    "boardSquareCounts": [
      64,
      96,
      256
    ],
    "expanded256Experimental": true,
    "onlineBoardSquareCount": 64,
    "onlineClockMinutesPerPlayer": [
      null,
      5,
      10
    ],
    "views": [
      "2D",
      "3D",
      "4D"
    ],
    "openingPreviewViews": [
      "2D",
      "3D",
      "4D"
    ],
    "iPadSideBySideViews": true,
    "iPhoneDuoLinkedViews": true,
    "pawnie": {
      "availableSince": "0.7",
      "guidance": "built-in authored contextual help",
      "remoteAIChat": false,
      "playsMoves": false,
      "optional": true,
      "helpLevels": [
        "On request",
        "Gentle",
        "Coach"
      ]
    },
    "lostSignal": {
      "availableSince": "0.7",
      "chambers": 20,
      "acts": 4,
      "free": true,
      "optional": true,
      "resumable": true,
      "sameStoryForBeginnerAndExperiencedGuidance": true
    },
    "puzzles": {
      "count": 102,
      "levels": 5,
      "spatialChallenges": 6,
      "freeSetSize": 3,
      "nextSet": "The following day after all three puzzles in the current set are solved",
      "unfinishedPuzzlesRemainAvailable": true,
      "retriesWithinCurrentSetFree": true,
      "plusAccess": "Unlimited access to all puzzles"
    },
    "dailyStreak": true,
    "learningProgressStorage": "on device",
    "plusOptional": true,
    "plusBillingPeriods": [
      "monthly",
      "yearly"
    ],
    "plusFeatures": [
      "Full helper with one possible opponent reply",
      "Deeper match analysis",
      "Additional Study reviews and personal practice",
      "Unlimited puzzle access",
      "All advanced Academy exercises",
      "Study notes, collections and insights"
    ],
    "freeStudy": {
      "newCompletedReviewsPerUTCDay": 1,
      "newPracticeExercisesPerUTCWeek": 3
    },
    "studyStorage": "on device",
    "savedGameSync": "private iCloud when available",
    "analysis": "bounded on-device search; no best-move or winning-chance guarantee"
  },
  "productGuideURL": "https://tessermate.dastan.chatgpt.site/product-guide.md",
  "videos": [
    {
      "title": "One position. A whole new perspective.",
      "url": "https://tessermate.dastan.chatgpt.site/watch/four-dimensional-board/",
      "contentUrl": "https://tessermate.dastan.chatgpt.site/media/four-dimensional-board.mp4",
      "durationSeconds": 8,
      "description": "Watch the opening rotate through the fourth-dimensional projection. The apparent sizes of boards and pieces change while their square addresses stay fixed.",
      "visualDescription": "The title asks, \u201cHow many pawns?\u201d A chess opening rotates in the 4D view. Boards and pawns appear nearer and farther away as the projection turns. Eight pawns remain in the same position throughout; only the view changes."
    },
    {
      "title": "One move. Another dimension.",
      "url": "https://tessermate.dastan.chatgpt.site/watch/mate-in-one/",
      "contentUrl": "https://tessermate.dastan.chatgpt.site/media/mate-in-one.mp4",
      "durationSeconds": 12,
      "description": "A queen\u2019s legal targets appear across the connected boards. The clip reveals a mating move in the flat view, then shows the finished position in 4D.",
      "visualDescription": "\u201cMate in one. Which dot?\u201d appears above a rotating position with the queen\u2019s legal targets lit. The video cuts to flat boards. A highlighted destination is chosen; the app reports checkmate and shows its result. The final view returns to the spatial board with a line from queen to king. The caption reads, \u201cTwo more dots also mate.\u201d"
    },
    {
      "title": "A familiar jump. New places to land.",
      "url": "https://tessermate.dastan.chatgpt.site/watch/knight-moves/",
      "contentUrl": "https://tessermate.dastan.chatgpt.site/media/knight-moves.mp4",
      "durationSeconds": 7.867,
      "description": "Follow a selected knight and its six highlighted destinations as the 4D view rotates. The L-shaped move extends across pairs of coordinate axes.",
      "visualDescription": "The title asks, \u201cOne knight. How many moves?\u201d A selected knight and its legal destinations remain highlighted while the four connected boards rotate in the projection. The position has six legal knight targets. No piece is moved in this clip."
    }
  ],
  "community": {
    "submission": "email draft",
    "publication": "editorial review and permission required"
  },
  "pages": {
    "/": {
      "title": "4D Chess for iPhone & iPad \u2014 watch, learn and play",
      "description": "Watch 4D Chess in motion. Meet Pawnie, play a 20-chamber story, explore 102 puzzles and see one position in 2D, 3D and 4D."
    },
    "/features/": {
      "title": "All features",
      "description": "Discover Pawnie, The Lost Signal, 102 puzzles, opening previews, linked board views, online games and Fourfold Plus study tools in 4D Chess."
    },
    "/learn/": {
      "title": "Learn 4D chess",
      "description": "Learn 4D chess with Pawnie, The Lost Signal, 102 puzzles across five levels, movement labs, spatial challenges and replay practice."
    },
    "/learn/first-game/": {
      "title": "Your first 4D chess game",
      "description": "A beginner guide to choosing a compact board, finding legal moves, using Quick helper and playing a first offline game."
    },
    "/learn/four-connected-boards/": {
      "title": "How four connected boards work",
      "description": "Understand the compact 4\u00d74\u00d72\u00d72 board and how rooks, bishops, knights, queens, kings and pawns move in Fourfold."
    },
    "/learn/study-and-replay/": {
      "title": "Study, replay and personal practice",
      "description": "Learn how replay, game exports, local Study reviews, practice exercises, notes and collections fit together in Fourfold."
    },
    "/online/": {
      "title": "Online chess: rooms, QR invites and matchmaking",
      "description": "Create a private online game, join with a room code or QR scan, find an opponent and troubleshoot connection or clock issues."
    },
    "/plus/": {
      "title": "Fourfold Plus: features and free comparison",
      "description": "Compare free play with Fourfold Plus: unlimited puzzles, Full helper, deeper analysis, Study reviews, practice, advanced Academy, notes and collections."
    },
    "/support/": {
      "title": "Help and support",
      "description": "Get help with 4D Chess online rooms, rules, saved games, iCloud, account deletion, Fourfold Plus, subscriptions and Study."
    },
    "/community/": {
      "title": "Community: share a study or player tip",
      "description": "Share a 4D chess study, teaching tip or annotated game for editorial review. Learn the contribution and privacy guidelines."
    },
    "/watch/": {
      "title": "4D Chess gameplay videos",
      "description": "Watch three short 4D Chess videos: the rotating board, a mate-in-one reveal and a knight\u2019s cross-space moves. Includes visual descriptions."
    },
    "/watch/four-dimensional-board/": {
      "title": "The turning board \u2014 gameplay video",
      "description": "Watch the opening rotate through the fourth-dimensional projection. The apparent sizes of boards and pieces change while their square addresses stay fixed."
    },
    "/watch/mate-in-one/": {
      "title": "The mate-in-one reveal \u2014 gameplay video",
      "description": "A queen\u2019s legal targets appear across the connected boards. The clip reveals a mating move in the flat view, then shows the finished position in 4D."
    },
    "/watch/knight-moves/": {
      "title": "The knight across spaces \u2014 gameplay video",
      "description": "Follow a selected knight and its six highlighted destinations as the 4D view rotates. The L-shaped move extends across pairs of coordinate axes."
    },
    "/learn/pawnie-and-lost-signal/": {
      "title": "Pawnie and The Lost Signal",
      "description": "Meet Pawnie, your built-in chess companion, and restore an observatory through twenty free, playable story chambers in 2D, 3D and 4D."
    },
    "/learn/puzzles/": {
      "title": "102 chess puzzles and daily practice",
      "description": "Explore 102 puzzles across five learning levels, six spatial challenges and daily streaks. Understand free sets of three and unlimited Fourfold Plus access."
    },
    "/whats-new/": {
      "title": "What\u2019s new in 4D Chess",
      "description": "Explore the major updates through version 0.7: Pawnie, The Lost Signal, opening previews, 102 puzzles, daily learning, wider layouts and Fourfold Plus."
    },
    "/privacy/": {
      "title": "Privacy policy",
      "description": "How 4D Chess handles accounts, online play, iCloud games, Study, subscriptions, analytics, diagnostics and website contributions."
    }
  }
}