Monster Hunter World
Monster Hunter World data
Free Sudoku puzzles, printable Sudoku worksheets and online play: https://sudokumax.com.
Online Sudoku - Sudokumax API is a free Games & Comics API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Free Sudoku API for apps and websites. Generate puzzles, check uniqueness, analyze difficulty and export PDF worksheets. API key and attribution required.
Details from sudokumax.com.

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Monster Hunter World data
Trivia Questions
Mojang / Minecraft API
The Online Sudoku - Sudokumax API is provided by Sudokumax (sudokumax.com). Free Sudoku API for apps and websites. Generate puzzles, check uniqueness, analyze difficulty and export PDF worksheets. API key and attribution required.
Yes. The Online Sudoku - Sudokumax API is listed in the Games & Comics category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Online Sudoku - Sudokumax API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Online Sudoku - Sudokumax API supports CORS, so front-end JavaScript can call it directly.
Yes. The Online Sudoku - Sudokumax API is served over HTTPS, so it's safe to use in production.