Terms & Privacy
Last updated 3 September 2026
Sumo Slap Down is a free fantasy-sumo site run by one person as a hobby. It is not affiliated with, endorsed by, or connected to the Nihon Sumo Kyōkai, sumo-api.com, or any stable or rikishi.
This page describes what the site actually does, written from the code rather than from a template. If something here doesn’t match what you see, the code is the bug — please report it.
- The short version
- What’s stored
- On your device
- Who else sees it
- What other players see
- Changing & deleting
- Using the site
- The service itself
The short version
- Signing up asks for a handle, an optional display name, and a PIN. No email address, no phone number, no real name.
- Your PIN never leaves your browser. It is hashed there (salted SHA-256) and only the hash is sent and stored.
- That is game-grade protection, not real security — anyone with edit access to the underlying spreadsheet can see everything in it. Do not reuse a PIN or password that matters to you anywhere else.
- No advertising, no ad networks, no third-party analytics, no cookies. Nothing is sold, rented, or shared for marketing.
What’s stored
Everything below lives in one private Google Sheet, reachable only through this site’s backend.
Your account
Handle, display name, the hash of your PIN, your mawashi avatar design, and an account status flag used for moderation.
Your play
Your seven-band team; keeper-league rosters, draft boards and picks; trades; which leagues you belong to and their settings; your archived score, win count and per-rikishi breakdown for each finished basho; your banzuke rank and streak; and any championships you win.
Things you write
League message-board posts, site message-board posts and votes, direct messages, and anything you send through the feedback or bug-report form.
Usage
One page-view record per page you open: a random id generated in your browser, the page
path, and your browser’s timezone name (for example America/Los_Angeles). That id is
not tied to your account and is not shared with anyone. No IP address is logged, no location
lookup is performed, and no cookie is set.
What your browser keeps on your device
These sit in your browser’s local storage, readable only by this site on this device. Clearing site data removes all of them.
fantasy.acct— your handle, display name and PIN hash, so you stay signed in.gg.visitorId— the anonymous page-view id described above.fantasy.team,dohyo.team,GG_MOCK_DRAFT— drafts in progress, so an unsaved team survives a refresh.gg.cardMode,taiko.radio.*— layout and audio preferences.
Who else sees anything
- Google — the backend runs on Google Apps Script and the data lives in Google Sheets. Fonts also load from Google Fonts, so Google sees your IP address for that request, as it would on any site using them.
- sumo-api.com — banzuke and bout results are fetched by your browser directly, so it sees your IP address for those requests.
- GitHub — the site is served from GitHub Pages.
That is the whole list. There are no analytics products, ad networks, or marketing tools on this site.
What other players can see
Your handle, display name, avatar, team, scores, banzuke rank and any titles are public to other players — that is the point of a shared leaderboard. Anything you post on a message board is public too.
Direct messages are visible to the person you send them to and to the site operator, because they sit in the same spreadsheet. Please don’t put anything sensitive in one.
Changing and deleting your data
You can change your handle, display name, avatar and team at any time from the account panel.
To delete your account and its data, send a message to the site operator — use Account → Messages when signed in, or the feedback form. Deleting removes your account row and the play data attached to it. Individual message-board posts can be removed on request too. There is no self-serve delete button yet; ask and it will be done by hand.
Using the site
- Be decent to other players. No harassment, hate, spam, or impersonating someone else.
- Don’t try to break, overload, or work around the backend, and don’t script it.
- One account per person. Don’t take a handle in order to pass yourself off as another player.
- Accounts can be warned, suspended or removed, and posts edited or deleted, at the operator’s discretion. Boards are lightly moderated by one person, not around the clock.
The service itself
The site is in beta. It is free, offered as-is with no guarantee of uptime or of the accuracy of anything on it, and it may change or stop without notice. Losing data would be unfortunate, not catastrophic — please don’t treat it as a system of record.
Rikishi data, banzuke and bout results come from sumo-api.com and the official JSA banzuke. Grades, Elo, projections, tier lists and simulations are one person’s model and opinion, not official and not predictions you should rely on.
There is no money involved. No entry fees, no prizes, no wagering — the leagues are played for nothing but standing.
The site isn’t directed at children under 13, and accounts shouldn’t be created by them.
Questions
Use the feedback form, or message the operator from Account → Messages. Corrections to this page are welcome — it is meant to describe what the site really does.