Developer Builds Free Sudoku API Using Rust and WebAssembly for Speed and Portability

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A developer has launched a free public Sudoku generation API called Sudoku100, with its core engine written in Rust and compiled to WebAssembly. The system uses a backtracking algorithm to fill a 9x9 grid with randomized candidate digits, then removes cells based on a difficulty target ranging from beginner to extreme. Puzzles at harder difficulty levels undergo a uniqueness check to ensure only one valid solution exists, preventing poor user experience. Compiling Rust to WebAssembly allows the same binary to run both in the browser and on the server, ensuring consistent puzzle output across environments. The developer chose WebAssembly specifically because Sudoku generation is CPU-intensive, making compiled code significantly faster than interpreted JavaScript at scale.

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