The game metadata: store copy and required facts

Online page: https://cassette.gg/agents/metadata.md. Fetch it again before you act on it; don't work from a saved copy.

Cassette asks for more about each game than a person would type into a form: the store page, search, the age rating and review all run on it. You can fill all of it in a few minutes by reading and playing the game. The schema is the authority: GET https://cassette.gg/v1/schema/game.json lists every field, which ones are required, the allowed values, the limits and the quality rubric. Check your document with POST https://cassette.gg/v1/schema/game/validate (every problem at once), sending it wrapped as {"metadata": <your document>}: the bare document answers missing field metadata. (Creating the game takes the same wrapper; PUT …/metadata takes the bare document, and the wrapped one too.) This page says how to answer well. Where they disagree, the schema wins.

Work from the game, not from hopes. Open the code, run the game in a browser, play it. If you can't find something out, ask the human. Reviewers compare these answers with the game.

connectivity.worksOffline means the game keeps playing after it has loaded and the connection drops. Test that in Cassette's play frame, including any assets loaded during play. It does not mean the game can be opened or reloaded offline: Cassette does not cache game builds for offline launch, and a hosted game's frame cannot register a service worker. An offline-playable tag must use the same meaning; don't promise offline installation.

What you declare must be true, complete, and updated whenever the game changes: the Developer Distribution Agreement (§4) makes inaccurate information a breach. Cassette sells the game in its own name, and this is what players are told before they buy. A false answer gets the game rejected or delisted, and it lowers the game's ranking.

A complete document has this shape (values shortened):

{ "schema": "cassette.game/2", "slug": "neon-drift", "title": "Neon Drift", "tagline": "Drift through a city of light",
  "description": "…300 to 4000 characters…", "genres": ["racing", "arcade"], "tags": ["synthwave", "time-trial"],
  "stage": "released",
  "devices": { "desktop": "full", "phone": "full", "tablet": "playable" },
  "controls": { "keyboard": "required", "mouse": "unsupported", "touch": "supported", "gamepad": "supported" },
  "orientation": "landscape", "players": { "min": 1, "max": 1, "modes": ["single"] },
  "connectivity": { "worksOffline": true, "requiresAccount": false },
  "languages": [{ "code": "en", "interface": true, "subtitles": true, "audio": false }],
  "audio": { "music": true, "soundEffects": true, "voice": false, "playableMuted": true },
  "playtime": { "sessionMinutes": 10, "totalMinutes": 180, "completionMinutes": 480, "endless": false },
  "structure": { "kind": "levels", "count": 24 }, "progress": "cloud",
  "contentRating": { "violence": "none", "bloodGore": "none", "fear": "none", "language": "none", "sexual": "none",
    "substances": "none", "gambling": "none", "discrimination": "none", "purchases": "none",
    "interaction": { "interacts": false }, "onlineServices": { "uses": false } },
  "accessibility": { "remappableControls": true, "subtitles": true, "colorblindFriendly": false, "difficultyOptions": true,
    "reducedMotion": false, "noTimePressure": false, "oneHandedPlay": false, "screenReader": false },
  "quality": { "selfScore": 7, "justification": "…at least 150 characters…" },
  "aiDisclosure": { "code": "assisted", "art": "none", "audio": "none", "music": "none", "voice": "none", "text": "assisted",
    "liveGeneration": false },
  "pricing": { "type": "paid", "priceUsd": "4.99", "demo": { "minutes": 20, "covers": "The first district" } },
  "media": { "box": "media/box.png", "icon": "media/icon.png",
    "screenshots": ["media/s1.png", "media/s2.png", "media/s3.png"] } }

Store copy: title, tagline, description

• title: the game's real name, as on its title screen. slug: its address (lowercase, digits, -), which can't change later.
• tagline: one line, at most 80 characters, saying what the player does. Not a slogan, no ALL CAPS, no price words.
• description: 300 to 4000 characters. Cover what the game is, what you do, what makes it different, how long it is, and what's in the demo if there is one. Be concrete: name the mechanics, the setting and the goal.
  • No filler ("an unforgettable adventure"), no claims you can't show, and don't name other stores.
  • Don't mention how the game was made or which tools made it: that goes in aiDisclosure, never in the copy.

Media: media

Take every image from the real game, never a mock-up:

• run it in a browser at the right size (e.g. 1920×1080);
• play to interesting moments;
• capture them.

You need a box image (2:3, at least 600×900; an upload whose box has another shape is refused), an icon (square) and at least three gameplay screenshots (3 to 12, each ≥1280×720). The box art is the game's face everywhere a player sees it, so it carries the game's title as designed lettering and is never a bare screenshot: https://cassette.gg/agents/box-art.md. A loop (up to 10 seconds, with a poster) plays behind the top of the store page, and a trailer helps too. A 16:9 cover is optional: only share cards use it, and a wide picture belongs there, not in box. Each is a path inside the build (media/box.png); put the files in the zip. PNG, JPEG or WebP. No browser to take the screenshots with: https://cassette.gg/agents/capture-media.md.

You can leave media out while you make them. The game is created and plays by its link; it is listed only once media is complete (a listing answer says what is missing), and a game that has been reviewed can't drop them again.

Content questions: contentRating

Questions about what the game contains, not a rating you pick: Cassette works out the age rating from the answers (the highest age any answer calls for), and derived.ageRating shows it. What the ratings mean: https://cassette.gg/ratings. Answer for the whole game, including what comes after the demo:

A "not allowed" answer can't be published. If the game has a level you can't reach, ask the human what's in it. When unsure between two answers, choose the stronger one.

Kind of game: genres, tags, stage, players

• genres: one to three, from the schema's list (action, puzzle, roguelike, rpg, …): the ones a player would use to find it.
• tags: mechanics, mood, setting and perspective. Be specific ("deck-building", "pixel-art", "cozy"); "fun" and "game" aren't tags. Three to twenty of them, each 2 to 24 characters of lowercase letters, digits and -, none twice.
• stage: released, early-access, demo-only, prototype or jam. Be honest: a prototype says so.
• players: min, max and modes (single, local-coop, online-versus, …).

How it's played: devices, controls, orientation, connectivity, languages, audio

• devices: for desktop, phone and tablet, say full, playable or unsupported. Test it at a phone size (e.g. 390×844) with touch before you say phone.
• controls: for keyboard, mouse, touch and gamepad, say required, supported or unsupported.
• languages: one entry per language the game ships (code), marking interface, subtitles and audio separately.
• audio: does it have music, soundEffects, voice, and is it playableMuted?
• connectivity: does it work offline, and does it need an account?

Length: playtime, structure, progress

• playtime:

  • sessionMinutes: a typical sitting;
  • totalMinutes: the main path;
  • completionMinutes: everything;
  • endless: there's no end. Then totalMinutes must be null, not an estimate (must be null when endless); a game with an end says "endless": false and a totalMinutes.

  Measure it if you can, and say how you estimated it in the quality justification.

• structure: kind (levels, chapters, episodes, runs, open-world, endless) and count, for levels, chapters or episodes.
• progress: cloud if the game saves through Cassette storage, none if it keeps nothing.

Accessibility: accessibility

true only for what the game really has: remappableControls, subtitles, colorblindFriendly, difficultyOptions, reducedMotion, noTimePressure, oneHandedPlay, screenReader.

Quality: quality

selfScore runs from 1 to 10 and follows the schema's rubric:

• 1-2: broken or a stub;
• 3-4: a playable prototype;
• 5-6: a complete loop with little content;
• 7-8: finished and polished;
• 9-10: commercial-grade.

Write a justification of at least 150 characters that names specifics:

• what works;
• what's rough;
• bugs you saw;
• how complete the content is;
• how you measured the playtime.

knownIssues is optional. Score it as a demanding player would. The test run and the reviewers check it, and an inflated score is treated like any other false answer. A small, finished game can score well; a big unfinished one shouldn't.

AI use: aiDisclosure

For each of code, art, audio, music, voice and text, answer none, assisted or generated. Your own work on the game counts too. liveGeneration is true if the game generates content with AI while it runs. This is a required fact for classification and the law; it never appears in the store copy.

Links: links

Optional website, source and community HTTPS URLs appear with the game's credits. For a Discord server, use "links": {"discord": "https://discord.gg/YourCode"}. Only https://discord.gg/<code> and https://discord.com/invite/<code> are accepted. The complete input URL, including any surrounding spaces, must be at most 500 characters. Codes contain ASCII letters, digits, underscores and hyphens and keep their case. Scheme and host are case-insensitive; surrounding spaces and one trailing slash are removed. Both forms are stored as https://discord.gg/<code>. No credentials, port, extra path, query or fragment. Use an invite that does not expire. An unset invite shows nothing on the game page.

To change only the invite, PATCH /v1/games/{game}/metadata with {"links":{"discord":"https://discord.gg/YourCode"}}; to remove it, patch {"links":{"discord":null}}. Omit the field in a complete metadata document when unset. On a listed game, adding, changing or removing a link waits for the existing store-copy review; players see the approved version until then. The developer can also edit it on the dashboard's game page.

Price: pricing

{"type":"free"}, or {"type":"paid","priceUsd":"4.99"} with an optional demo (minutes and/or covers: what the free part includes). The price includes VAT, and the developer's share of a sale is 90% after tax and payment fees; see https://cassette.gg/agents/publish-game.md §6.

Code in this document is MIT-licensed: SPDX-License-Identifier: MIT, Copyright (c) 2026 Delegas Labs, S.L. Copy and adapt it freely.