Serve fresh Sudoku puzzles at any difficulty level.
Sudoku Generator creates 9x9 Sudoku puzzle grids across multiple difficulty settings, with empty cells marked as zeros. Paid plans add the full solution grid for validation or hints.
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About the Sudoku Generator API
Pass a difficulty level of easy, medium, hard, or expert, or omit the parameter to default to medium. The API creates a 9x9 number grid containing the puzzle, marking unfilled spaces with zeros. Paid tiers also return the complete solution grid.
What people use it for
- Daily Newspaper Puzzles
- Editors generate fresh grids every morning to populate print syndicated puzzle columns across graded difficulty levels.
- Mobile Brain Teasers
- When a player starts a new match, game servers fetch a 9x9 board matching the player's chosen challenge tier.
- Classroom Logic Exercises
- Math instructors build printable worksheets featuring easy and medium grids to teach deduction rules to elementary students.
- Senior Mental Fitness
- Deliver randomized daily logic challenges directly to retirement community web portals without storing or manually designing static boards.
Ways to call it
One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.
- JSON
- Default REST response
- XML
- Markup format
- YAML
- Human-readable
- CSV
- Tabular export
- GraphQL
- Query language
- MCP
- For AI agents
Other ways to use Sudoku Generator
Same data, same APIVerve account, same credit balance — one key works on all of them.
Can I specify the difficulty level of the generated puzzle?
Is the completed puzzle solution included on the Free plan?
Is it cheap enough to generate a new puzzle for every game session?
What grid dimensions does the generator output?
How are blank cells marked in the generated puzzle grid?
Request parameters — GET /v1/sudoku
Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.
Optional
| Parameter | Type | Example | Description |
|---|---|---|---|
difficultyOptional | string | medium | The difficulty level of the Sudoku puzzle to generateeasymediumhardexpertdefault medium |
curl "https://api.apiverve.com/v1/sudoku?difficulty=medium" \
-H "x-api-key: YOUR_API_KEY"Authentication
Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.
| Header | When | Value |
|---|---|---|
x-api-keyRequired | Every request | Your API key. Header names are case-insensitive, so X-API-Key is the same header. |
AuthorizationAlternate | Instead of the above | Bearer <key> — for clients that only expose bearer auth. Resolves to the same account and the same billing. |
A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.
Response — GET /v1/sudoku
Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.
{
"status": "ok",
"error": null,
"data": {
"puzzle": {
"grid": "674--3---1---72-9-5----1--4------8-3-1---8--52----61--7-1----8--53-97--19--8-4---",
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value='4' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='6' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='5' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='1' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='2' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='9' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='8' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='7' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;border-right: 3px solid #000;'> <input type='text' value='3' maxlength='1' disabled /> </td></tr><tr><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='3' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='1' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='9' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='7' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='4' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='8' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='6' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='2' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;border-right: 3px solid #000;'> <input type='text' value='5' maxlength='1' disabled /> </td></tr><tr><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='2' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='8' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='7' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='5' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='3' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='6' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='1' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='4' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;border-right: 3px solid #000;'> <input type='text' value='9' maxlength='1' disabled /> </td></tr><tr><td style='border-top: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='7' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='4' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='1' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='3' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='6' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='5' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='9' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='8' maxlength='1' disabled /> </td><td style='border-top: 3px solid #000;border-left: 1px solid #000;border-right: 3px solid #000;'> <input type='text' value='2' maxlength='1' disabled /> </td></tr><tr><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='8' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='5' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='3' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='2' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='9' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='7' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 3px solid #000;'> <input type='text' value='4' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;'> <input type='text' value='6' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-left: 1px solid #000;border-right: 3px solid #000;'> <input type='text' value='1' maxlength='1' disabled /> </td></tr><tr><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='9' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='2' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='6' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='8' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='1' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='4' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 3px solid #000;'> <input type='text' value='3' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 1px solid #000;'> <input type='text' value='5' maxlength='1' disabled /> </td><td style='border-top: 1px solid #000;border-bottom: 3px solid #000;border-left: 1px solid #000;border-right: 3px solid #000;'> <input type='text' value='7' maxlength='1' disabled /> </td></tr></table></body></html>",
"image": {
"imageName": "d0a6a5a0-c0e3-44cb-8417-e6590f793a7c_solution.png",
"format": ".png",
"downloadURL": "https://storage.googleapis.com/apiverve/APIData/sudoku/d0a6a5a0-c0e3-44cb-8417-e6590f793a7c_solution.png?GoogleAccessId=635500398038-compute%40developer.gserviceaccount.com&Expires=1766010586&Signature=LVChpKLTdpScYP%2F%2FmDSgy9wp%2FECkftQIjWK%2FRZ8dtUjv%2BchJNL5u43Rwkwoh8y7%2FurdHnOUFookVLNJp6EeIMlhHsh9e%2BF5kWaVbZwPfzvVwVWWScoL%2FDx9c6wXm8svbqTb6tXgun8IPaeyt80xTFtg2swAphkB4KS00H5z4Te2O2RL%2F2Op%2BVZu7eVEpQUmTcZ1kR0Nahm5ueeIIPWvUIetV5N5%2FAnzGi5RvyFx0oFIJjPj9zSfi0jPxMbYSUIwF4ZQwyq5e9B%2BeCnX8atCyCs8UN2Sc1ZkFC0BA0ya5t%2F5AoxkdJWeMwMIo%2BcY7jk5anJShVhu9UT6m5bIpSaKdUA%3D%3D",
"expires": 1766010586850
}
},
"difficulty": "medium"
}
}
Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
puzzle | object | {...} | 9x9 grid representing the Sudoku puzzle with 0s for empty cells |
grid | string | "674--3---1---72-9-5----1--4------8-3-1---8--52----61--7-1----8--53-97--19--8-4---" | |
html | string | "<html><head><title>Sudoku Puzzle</title><style>table {border-collapse: collapse; width: 300px; height: 300px;}td {text-align: center; width… | |
image | object | {...} | |
imageName | string | "d1b59df4-7ab2-474e-b269-e34ce212b469_puzzle.png" | |
format | string | ".png" | |
downloadURL | string | "https://storage.googleapis.com/apiverve/APIData/sudoku/d1b59df4-7ab2-474e-b269-e34ce212b469_puzzle.png?GoogleAccessId=635500398038-compute%… | |
expires | number | 1766010586784 | |
solutionPremium | object | {...} | Complete solution grid for the puzzle |
gridPremium | string | "674953218138472596592681734465129873319748625287536149741365982853297461926814357" | |
htmlPremium | string | "<html><head><title>Sudoku Solution</title><style>table {border-collapse: collapse; width: 300px; height: 300px;}td {text-align: center; wid… | |
imagePremium | object | {...} | |
imageNamePremium | string | "d0a6a5a0-c0e3-44cb-8417-e6590f793a7c_solution.png" | |
formatPremium | string | ".png" | |
downloadURLPremium | string | "https://storage.googleapis.com/apiverve/APIData/sudoku/d0a6a5a0-c0e3-44cb-8417-e6590f793a7c_solution.png?GoogleAccessId=635500398038-comput… | |
expiresPremium | number | 1766010586850 | |
difficulty | string | "medium" | Difficulty level of the generated puzzle |
Response headers
Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.
| Header | What it carries |
|---|---|
x-api-remaining-credits | Credits left in the current cycle |
x-api-credits-used | Credits spent in the current cycle |
x-api-max-credits | The allowance for the cycle |
x-api-version | Version of the endpoint that answered |
Errors
Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.
| Status | Meaning | What to do |
|---|---|---|
400 | Input was rejected | Read error; it names the parameter that has to change. |
401 | Key missing or invalid | Check the header name and the key value. |
403 | Key valid, but not permitted here | A key restriction or an IP allow-list — never a bad key. |
429 | Rate limited, or out of credits | Read error to tell them apart, then back off or top up. |
What a call costs — 4 credits per call
Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.
| Plan | Per month | Credits | Sudoku Generator calls | Per 1,000 calls |
|---|---|---|---|---|
| Free | Free | 200 | 50 | Free |
| Starter | $29.99 | 200,000 | 50,000 | $0.60 |
| Pro | $99.99 | 1,000,000 | 250,000 | $0.40 |
| Mega | $299.99 | 4,000,000 | 1,000,000 | $0.30 |
Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.
Call it from cURL — GET /v1/sudoku
No SDK to install — this is a plain HTTPS call to /v1/sudoku with your key in the x-api-key header. Swap in a real key and it runs as-is.
curl "https://api.apiverve.com/v1/sudoku" \
-H "x-api-key: YOUR_API_KEY"Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Node.js — GET /v1/sudoku
Install the Node.js SDK, then call the Sudoku Generator API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
npm install @apiverve/sudokuconst res = await fetch("https://api.apiverve.com/v1/sudoku", {
headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Python — GET /v1/sudoku
No SDK to install — this is a plain HTTPS call to /v1/sudoku with your key in the x-api-key header. Swap in a real key and it runs as-is.
import requests
res = requests.get(
"https://api.apiverve.com/v1/sudoku",
headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from C# / .NET — GET /v1/sudoku
Install the C# / .NET SDK, then call the Sudoku Generator API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
dotnet add package APIVerve.API.SudokuGeneratorusing var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");
var json = await client.GetStringAsync("https://api.apiverve.com/v1/sudoku");
Console.WriteLine(json);Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Go — GET /v1/sudoku
No SDK to install — this is a plain HTTPS call to /v1/sudoku with your key in the x-api-key header. Swap in a real key and it runs as-is.
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/sudoku", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from PHP — GET /v1/sudoku
No SDK to install — this is a plain HTTPS call to /v1/sudoku with your key in the x-api-key header. Swap in a real key and it runs as-is.
$ch = curl_init("https://api.apiverve.com/v1/sudoku");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);
$response = curl_exec($ch);
echo $response;Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Ruby — GET /v1/sudoku
No SDK to install — this is a plain HTTPS call to /v1/sudoku with your key in the x-api-key header. Swap in a real key and it runs as-is.
require "net/http"
uri = URI("https://api.apiverve.com/v1/sudoku")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"
res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.bodyResources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Zero-code embed — one snippet, no backend
Drop an interactive Sudoku Generator form onto any page. The widget calls the API for you, so no key ever appears in your markup and there is nothing to deploy.
Changelog — Sudoku Generator API
Every change to this endpoint, newest first. Breaking changes ship as a new version and the previous one keeps serving — response fields are added, never removed or retyped in place, so an integration written against v1 keeps working.
Entries are picked up from dated catalog snapshots, so the first one appears after the next snapshot that moves something. A period where nothing changed produces no entry — silence is a valid changelog for the Sudoku Generator API.
Entertainment
- Advice Generator
- Bucket List
- Charades Generator
- Chess Move Validator
- Chuck Norris Jokes
- Compliment Generator
- D&D Generator
- Dad Jokes
- Fortune Teller
- Historical Events
- Love Calculator
- Magic 8-Ball
- Music Note Generator
- Never Have I Ever
- Pictionary Generator
- Random Facts
- Random Joke
- Random Pun
- Random Quote
- Scrabble Word Scorer
- Sudoku Generator
- Trivia Generator
- Truth or Dare
- Wordle Helper
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