Generates not-so-random numbers for you to play in the lottery, making sure you repeat as little numbers as possible to increase your chances of winning. And it actually works! Unlike 90% of the lottery userscripts!
// ==UserScript==
// @name Neopets: Lottery Numbers Generator
// @namespace https://github.com/saahphire/NeopetsUserscripts
// @version 1.0.0
// @description Generates not-so-random numbers for you to play in the lottery, making sure you repeat as little numbers as possible to increase your chances of winning. And it actually works! Unlike 90% of the lottery userscripts!
// @author saahphire
// @homepageURL https://github.com/saahphire/NeopetsUserscripts
// @homepage https://github.com/saahphire/NeopetsUserscripts
// @match *://*.neopets.com/games/lottery.phtml
// @icon https://www.google.com/s2/favicons?sz=64&domain=neopets.com
// @license Unlicense
// ==/UserScript==
/*
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☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦ ⠂⠄⠄⠂⠁⠁⠂⠄⠂⠄⠄⠂☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦ ⠂⠄⠄⠂⠁⠁⠂⠄⠂⠄⠄⠂☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦
This script works as of October 19th, 2025. It doesn't use GM3 and does the following:
- Generates numbers for you to play in the lottery
- Ensures these numbers are only repeated the minimum possible amount of times between different tickets
- Buys and generates at the same time
- Adds a button for you to buy your lucky numbers instead of random ones. The button disappears after you buy them.
- Adds both buttons to a fixed location so you don't have to move your mouse between tickets
- Makes both buttons unclickable while the server is processing your request so it doesn't give you an error page
I tried making my own script but gave up in the middle. Math hurts my head.
The idea of interleaving numbers is from https://www.andrew.cmu.edu/user/kmliu/neopets/lottery2.html
✦ ⌇ saahphire
☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦ ⠂⠄⠄⠂⠁⠁⠂⠄⠂⠄⠄⠂☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦ ⠂⠄⠄⠂⠁⠁⠂⠄⠂⠄⠄⠂☆ ⠂⠄⠄⠂⠁⠁⠂⠄⠄⠂✦
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*/
// Add your lucky numbers here! If you'd like to get rid of the lucky button instead, change "true" to "false"
const enableLuckyButton = true;
const luckyNumbers = [1, 2, 3, 4, 5, 6];
const verbose = true;
const inputNames = ["one", "two", "three", "four", "five", "six"];
const interleave = (array) => {
const res = [];
const a = array.slice(0, Math.floor(array.length / 2));
const b = array.slice(Math.ceil(array.length / 2));
for(var i = 0; i < a.length; i++) {
res[i * 2] = a[i];
res[i * 2 + 1] = b[i];
}
return res;
}
const fisherYatesShuffle = (array) => {
for (let i = array.length - 1; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
return array;
}
const interleaveNTimes = (array, n) => {
if(n === 0) return array;
return interleaveNTimes(interleave(array), n - 1);
}
const getCurrentNumbers = () => [...document.querySelector(".content p:nth-of-type(3)").childNodes]
.filter((e, i) => i % 4 === 2)
.flatMap(txt => txt.textContent.match(/\d+/g).map(num => parseInt(num)))
.sort((a, b) => a - b);
const getRemoveFrom = (currentNumbers) => {
return currentNumbers
.filter((number, index) => currentNumbers.findIndex(n => n === number) === index)
.map(number => [number, Array.from(new Array(Math.min(currentNumbers.filter(n => n === number).length, 4)), (e, i) => fisherYatesShuffle([0, 1, 2, 3])[i])]);
}
const isValidArray = (array, previousTicketNumbers) => {
if(array.some((number, index) => array.findIndex(n => n === number) !== index)) return false;
for(let i = 0; i < previousTicketNumbers.length; i += 6)
if(previousTicketNumbers.slice(i, i + 6).every(number => array.findIndex(n => n === number) !== -1)) return false;
return true;
}
const createTicketNumbers = (currentNumbers, attempts = 0) => {
if(attempts > 250) throw new Error("Too many shuffling attempts!");
const removeFrom = getRemoveFrom(currentNumbers);
const numbers = Array.from(new Array(4), () => Array.from(new Array(30), (_, i) => i + 1));
removeFrom.forEach(([number, arrays]) => arrays.forEach(array => numbers[array] = numbers[array].slice(0, number - 1).concat(numbers[array].slice(number))));
let interleaved = Array.from(new Array(4), () => []);
for(let i = 0; i < 3; i++)
interleaved[i] = interleaveNTimes(fisherYatesShuffle(numbers[i]), i * 2);
const result = interleaved.flat();
if(isValidArray(result.slice(0, 6), currentNumbers)) return result;
return createTicketNumbers(currentNumbers, attempts + 1);
}
const getRandomTicketNumbers = (currentNumbers) => {
if(currentNumbers.length === 6) return currentNumbers;
const newNumber = Math.ceil(Math.random() * 30);
return getRandomTicketNumbers(currentNumbers.includes(newNumber) ? currentNumbers : currentNumbers.concat([newNumber]));
}
const fillTicket = (numbers) => {
const sorted = numbers.sort((a, b) => a - b);
inputNames.forEach((name, index) => {
document.querySelector(`input[name="${name}"]`).value = sorted[index];
});
}
const fillLotteryNumbers = () => {
const currentNumbers = getCurrentNumbers();
if(currentNumbers.length >= 120) return false;
try {
const numbers = createTicketNumbers(currentNumbers);
if(verbose) console.log(`Generated ticket numbers (only the first six will be used): [${numbers.join(', ')}]`);
fillTicket(numbers.slice(0, 6));
} catch (e) {
console.error(e);
document.querySelector(".content p:nth-of-type(2)").insertAdjacentHTML("beforeBegin", `<p style="color:darkred">Something went wrong! You can buy non-optimized numbers like usual or refresh the page.</p><p style="color:red;">${e}</p>`);
fillTicket(getRandomTicketNumbers(currentNumbers));
}
return true;
}
const addLuckyButton = (form) => {
if(!enableLuckyButton) return;
const orderedLucky = luckyNumbers.sort((a, b) => a - b);
const alreadyPlayed = [...document.querySelector(".content p:nth-of-type(3)").childNodes]
.filter((e, i) => i % 4 === 2).
some(t => t.textContent.replace(":", "").trim() === orderedLucky.join(" "));
if(alreadyPlayed) return;
const luckyButton = document.createElement("input");
luckyButton.type = "button";
luckyButton.value = "Buy Your Lucky Ticket!";
luckyButton.style = "padding: 1em;"
document.querySelector('input[form="lottery"]').insertAdjacentElement("afterEnd", luckyButton);
luckyButton.addEventListener("click", () => {
luckyNumbers.forEach((n, i) => document.querySelector(`input[name="${inputNames[i]}"]`).value = n);
form.submit();
});
return luckyButton;
}
const moveButton = (form) => {
const button = form.querySelector('input[type="submit"]');
document.querySelector(".content p:nth-of-type(2)").insertAdjacentElement("beforeBegin", button);
form.id = "lottery";
button.setAttribute("form", "lottery");
button.style = "padding: 1em;";
return button;
}
const changeHTML = (canBuy) => {
const form = document.querySelector('form[action="process_lottery.phtml"]');
const buyButton = moveButton(form);
if(canBuy) {
const luckyButton = addLuckyButton(form);
form.addEventListener("submit", () => {
buyButton.disabled = true;
luckyButton.disabled = true;
})
}
else {
buyButton.disabled = true;
buyButton.value = "All 20 tickets have been bought!"
document.querySelectorAll('input[size="2"]').forEach(input => input.disabled = true);
}
}
(function() {
'use strict';
const canBuy = fillLotteryNumbers();
changeHTML(canBuy);
})();