script.js

const questionBank=[
{
q:"Prime factorisation of 24?",
correct:"2³ × 3",
wrong:["2² × 3","2⁴ × 3","2³ × 6"],
hint:"24 = 8 × 3"
},
{
q:"Prime factorisation of 30?",
correct:"2 × 3 × 5",
wrong:["2² × 3 × 5","3 × 5","2 × 15"],
hint:"30 is even"
},
{
q:"Prime factorisation of 36?",
correct:"2² × 3²",
wrong:["2 × 3²","2² × 3","6²"],
hint:"36 = 6 × 6"
},
{
q:"Prime factorisation of 40?",
correct:"2³ × 5",
wrong:["2² × 5","2⁴ × 5","2³ × 10"],
hint:"40 = 8 × 5"
},
{
q:"Prime factorisation of 50?",
correct:"2 × 5²",
wrong:["2² × 5","5³","10²"],
hint:"50 = 2 × 25"
},
{
q:"Prime factorisation of 54?",
correct:"2 × 3³",
wrong:["2² × 3³","2 × 3²","3⁴"],
hint:"54 = 2 × 27"
},
{
q:"Prime factorisation of 63?",
correct:"3² × 7",
wrong:["3 × 7","3³ × 7","9 × 7²"],
hint:"63 = 9 × 7"
},
{
q:"Prime factorisation of 64?",
correct:"2⁶",
wrong:["2⁵","2⁷","4⁶"],
hint:"Power of 2"
},
{
q:"Prime factorisation of 75?",
correct:"3 × 5²",
wrong:["3² × 5","5³","15 × 5"],
hint:"75 = 3 × 25"
},
{
q:"Prime factorisation of 81?",
correct:"3⁴",
wrong:["3³","3⁵","9³"],
hint:"81 = 9 × 9"
},
{
q:"Prime factorisation of 90?",
correct:"2 × 3² × 5",
wrong:["2² × 3² × 5","3² × 5","2 × 3 × 5"],
hint:"90 = 9 × 10"
},
{
q:"Prime factorisation of 98?",
correct:"2 × 7²",
wrong:["2² × 7","7³","14²"],
hint:"98 = 2 × 49"
},
{
q:"Prime factorisation of 108?",
correct:"2² × 3³",
wrong:["2³ × 3²","2² × 3²","4 × 27"],
hint:"108 = 4 × 27"
},
{
q:"Prime factorisation of 125?",
correct:"5³",
wrong:["5²","5⁴","25²"],
hint:"125 = 5 × 25"
},
{
q:"Prime factorisation of 144?",
correct:"2⁴ × 3²",
wrong:["2³ × 3²","2⁴ × 3","12²"],
hint:"144 = 16 × 9"
},
{
q:"LCM of 4 and 6?",
correct:"12",
wrong:["6","24","18"],
hint:"Use highest powers"
},
{
q:"LCM of 6 and 8?",
correct:"24",
wrong:["12","48","16"],
hint:"Find first common multiple"
},
{
q:"LCM of 5 and 7?",
correct:"35",
wrong:["12","49","70"],
hint:"Both are prime"
},
{
q:"LCM of 10 and 15?",
correct:"30",
wrong:["15","45","60"],
hint:"Use highest powers"
},
{
q:"LCM of 12 and 16?",
correct:"48",
wrong:["24","96","32"],
hint:"Prime factorise both"
},
{
q:"LCM of 14 and 21?",
correct:"42",
wrong:["21","84","28"],
hint:"Look for common factors"
},
{
q:"LCM of 15 and 25?",
correct:"75",
wrong:["50","25","100"],
hint:"Use highest powers"
},
{
q:"LCM of 16 and 20?",
correct:"80",
wrong:["40","160","60"],
hint:"Use prime factors"
},
{
q:"LCM of 18 and 24?",
correct:"72",
wrong:["36","48","96"],
hint:"Highest powers"
},
{
q:"LCM of 20 and 30?",
correct:"60",
wrong:["30","90","120"],
hint:"Common multiple"
},
{
q:"LCM of 21 and 28?",
correct:"84",
wrong:["42","168","56"],
hint:"Prime factorise"
},
{
q:"LCM of 24 and 36?",
correct:"72",
wrong:["36","108","144"],
hint:"Use highest powers"
},
{
q:"LCM of 25 and 30?",
correct:"150",
wrong:["75","300","100"],
hint:"25 = 5²"
},
{
q:"LCM of 27 and 36?",
correct:"108",
wrong:["54","216","72"],
hint:"Highest powers"
},
{
q:"LCM of 32 and 48?",
correct:"96",
wrong:["48","192","64"],
hint:"2 powers"
},
{
q:"GCD of 12 and 18?",
correct:"6",
wrong:["3","12","18"],
hint:"Common factors"
},
{
q:"GCD of 15 and 20?",
correct:"5",
wrong:["10","15","20"],
hint:"List factors"
},
{
q:"GCD of 24 and 36?",
correct:"12",
wrong:["6","24","18"],
hint:"Use lowest powers"
},
{
q:"GCD of 30 and 45?",
correct:"15",
wrong:["5","30","45"],
hint:"Both divisible by 15"
},
{
q:"GCD of 40 and 60?",
correct:"20",
wrong:["10","40","30"],
hint:"Common factors"
},
{
q:"GCD of 42 and 56?",
correct:"14",
wrong:["7","28","21"],
hint:"Prime factors"
},
{
q:"GCD of 48 and 72?",
correct:"24",
wrong:["12","36","48"],
hint:"Use lowest powers"
},
{
q:"GCD of 50 and 75?",
correct:"25",
wrong:["5","50","15"],
hint:"Common factor"
},
{
q:"GCD of 54 and 81?",
correct:"27",
wrong:["9","18","54"],
hint:"Both divisible by 27"
},
{
q:"GCD of 63 and 84?",
correct:"21",
wrong:["7","42","28"],
hint:"Lowest powers"
},
{
q:"GCD of 64 and 96?",
correct:"32",
wrong:["16","48","64"],
hint:"Powers of 2"
},
{
q:"GCD of 72 and 108?",
correct:"36",
wrong:["18","72","54"],
hint:"Common factors"
},
{
q:"GCD of 75 and 100?",
correct:"25",
wrong:["5","50","75"],
hint:"25 works"
},
{
q:"GCD of 81 and 108?",
correct:"27",
wrong:["9","54","81"],
hint:"3 powers"
},
{
q:"GCD of 90 and 135?",
correct:"45",
wrong:["15","30","90"],
hint:"Common factors"
},
{
q:"What does GCD stand for?",
correct:"Greatest Common Divisor",
wrong:["Greatest Common Difference","General Common Divisor","Great Divisor"],
hint:"Largest shared factor"
},
{
q:"What does LCM stand for?",
correct:"Least Common Multiple",
wrong:["Largest Common Multiple","Lowest Common Factor","Least Common Factor"],
hint:"Smallest shared multiple"
},
{
q:"LCM uses...",
correct:"Highest powers",
wrong:["Lowest powers","No powers","Division"],
hint:"Think multiples"
},
{
q:"GCD uses...",
correct:"Lowest powers",
wrong:["Highest powers","No powers","Subtraction"],
hint:"Think common factors"
},
{
q:"Euclidean Algorithm finds...",
correct:"GCD",
wrong:["LCM","Prime Factors","Multiples"],
hint:"Greatest common divisor"
},
{
q:"The Euclidean algorithm can use...",
correct:"Division",
wrong:["Fractions","Decimals","Percentages"],
hint:"Faster than subtraction"
}
];

let xp=0, hearts=5, streak=0, asked=0;
let current=null;

function shuffle(arr){
  return [...arr].sort(()=>Math.random()-0.5);
}

function randomQuestion(){
  return questionBank[Math.floor(Math.random()*questionBank.length)];
}

document.getElementById("hint").textContent="";
hintBtn.onclick=()=>hint.textContent=current.hint;

function loadQuestion(){
  current=randomQuestion();
  document.getElementById("question").textContent=current.q;

  const answers=shuffle([current.correct,...current.wrong]);
  const area=document.getElementById("answers");
  area.innerHTML="";

  answers.forEach(answer=>{
    const btn=document.createElement("button");
    btn.textContent=answer;
    btn.onclick=()=>select(answer);
    area.appendChild(btn);
  });

  document.getElementById("progressFill").style.width=((asked%20)/20*100)+"%";
}

function select(answer){
  if(answer===current.correct){
    xp+=10;
    streak++;
    asked++;
    document.getElementById("feedback").textContent="✅ Correct!";
  }else{
    hearts--;
    streak=0;
    document.getElementById("feedback").textContent="❌ Incorrect";
  }

  document.getElementById("xp").textContent=xp;
  document.getElementById("streak").textContent=streak;
  document.getElementById("hearts").textContent=hearts;

  if(hearts<=0){
    document.querySelector(".card").innerHTML=`
    <h2>💀 Game Over</h2>
    <p>Final XP: ${xp}</p>
    <button onclick="location.reload()">Play Again</button>`;
    return;
  }

  setTimeout(()=>{
    document.getElementById("feedback").textContent="";
    loadQuestion();
  },700);
}

loadQuestion();