dobble online generator

This tool generates Dobble-style symbol decks by applying a finite projective plane construction of order q (prime power). The deck contains N = q^2+q+1 cards, each with k = q+1 symbols, and any two cards share exactly one symbol. It is intended for game designers, educators, and hobbyists who need provably balanced decks for testing speed rounds, classroom activities, or published game formats.
Core logic labels a symbol pool of size N and assigns symbols to each card according to the projective-plane layout. Mandatory features include deterministic generation with a chosen order q, full overlap guarantees, and a structured card representation. Optional features include seeding for repeatable randomness, subset filtering to produce smaller decks, and export formatting in JSON or CSV to integrate with other tooling.
Typical workflows: choose q, optionally set a seed, generate deck, inspect first few cards, and export. The tool supports educational demonstrations of combinatorial design, rapid prototyping of Dobble-like games, and data-driven testing of symbol distribution across cards.