About

Reliability and clarity are the cornerstones of a successful Bingo event. This tool is engineered to serve as a complete Master Control Station for 75-ball Bingo games. Unlike basic random number generators, this system maintains a strict, state-aware history of called numbers, preventing duplicates and providing a visual audit trail essential for verifying wins.

Designed for large displays and projectors, the interface prioritizes high-contrast visibility. It integrates Web Speech API for automated vocalization, ensuring consistent cadence and reducing caller fatigue. The internal logic handles the B-I-N-G-O column constraints strictly (e.g., N is always 31 - 45) and offers adjustable timing to match the pace of your audience.

Formulas

The core mechanic relies on a non-replacement selection from the finite set S = {1, 2, ..., 75}. The probability P of drawing any specific number n on the k-th draw is:

{

175 − (k − 1) if n ∉ H_k-10 if n ∈ H_k-1

Where H is the history set of previously called numbers. The game loop operates on a strictly monotonic entropy increase until |H| = 75.

Reference Data

Column	Range	Typical Color	Probability (Call 1)	Nickname Examples
B	1 - 15	Blue	175	Kelly's Eye (1), Baker's Dozen (13)
I	16 - 30	Red	174	Coming of Age (18), Key of the Door (21)
N	31 - 45	White	173	Two Little Ducks (22), Halfway There (45)
G	46 - 60	Green	172	Droopy Drawers (44), Grandma's House (50)
O	61 - 75	Orange	171	Clickety Click (66), Top of the Shop (75)

Frequently Asked Questions

No. This system is hard-coded for the US/Standard 75-ball format to ensure the visual grid layout (5x15) remains perfectly readable and mapped to the B-I-N-G-O letters.

Yes, it utilizes the browser's native Web Speech API. However, the quality and variety of voices depend on your specific operating system (Windows/macOS/Android).

Use the "Master Board" section at the bottom. Any number that has been called is highlighted. You can visually cross-reference the player's card against the highlighted cells on the screen.

This tool uses volatile session state to ensure fair play (no caching of previous games). If you reload, the board resets. This is a security feature to prevent tampering with the draw sequence.