math game code

function mathify(){
    document.body.innerHTML="<h1>Random Math Thing™</h1><h2><span id='pn'>0</span> points [Best: <span id='bp'>0</span>]</h2><div id='mn'><span id='n1'></span> <span id='op'></span> <span id='n2'></span> = <input id='in'> <button id='sm' style='border:2px solid white;font-family:inherit;color:white;background-color:black'>Submit</button>  <span id='rw'></span><br><span id='tm'></span></div><div id='ps' style='display:none'><h3>Paused</h3></div><br><button id='pb'>▶️</button>"
    document.body.style.color = "white"
    document.body.style.backgroundColor = "black"
    document.body.style.textAlign = "center"
    document.body.style.fontFamily = "Verdana"
    const $ = x => document.getElementById(x)
    const n1 = $("n1")
    const n2 = $("n2")
    const op = $("op")
    const inp = $("in")
    const sm = $("sm")
    const rw = $("rw")
    const tm = $("tm")
    const pn = $("pn")
    const main = $("mn")
    const ps = $("ps")
    const pb = $("pb")
    const bp = $("bp")
    let nm1 = 1
    let nm2 = 2
    let opr = 0
    let ansr = 3
    let maxtime = 3
    let time = 3
    let int = 0
    let d = Date.now()
    let canSubmit = true
    let points = 0
    let paused = false
    let bestpoints = 0
    function run(){
        inp.selected = true
        canSubmit = true
        time = maxtime
        n1.textContent = nm1
        n2.textContent = nm2
        op.textContent = (["+","-","*"])[opr]
        rw.textContent = "➖"
        inp.value = ""
        int = setInterval(function(){
            if(paused)return;
            let diff = (Date.now()-d)/1000
            d = Date.now()
            time-=diff
            if(time<=0){
                tm.textContent = "0s"
                generate(false)
            }else tm.textContent = time.toFixed(2)+"s"
        },50)
    }
    function rand(x){
        return Math.floor(Math.random()*x)
    }
    function cop(a,b,c){
        return opr==0?a:(opr==1?b:c)
    }
    function pav(){
        return (points+bestpoints)/2
    }
    function generate(overload){
        if(!canSubmit||(overload&&!inp.value))return;
        canSubmit = false
        clearInterval(int)
        let input = inp.value
        if(overload&&Number(input)==ansr){
            let base = (nm1*nm2)**0.5*(0.2+opr/50)
            let diff = (maxtime-time)/maxtime
            points+=base/2+base*diff
        }else points=points-Math.min(points-points*0.75,1)
        points = Math.max(points,0)
        bestpoints = Math.max(points,bestpoints)
        pn.textContent = points.toFixed(2)
        bp.textContent = bestpoints.toFixed(2)
        rw.textContent = (!overload)?"⏲️":Number(input)==ansr?"✔️":"❌"
        nm1 = cop(rand(pav()**1.2+5),rand(pav()**0.8+7),rand(pav()**0.4+6))+1
        nm2 = cop(rand(pav()**1.2+5),rand(pav()**0.8+7),rand(pav()**0.4+6))+1
        opr = rand((bestpoints>=5?3:(bestpoints>=2?2:1)))
        ansr = cop(nm1+nm2,nm1-nm2,nm1*nm2)
        maxtime = 3+opr*0.5+Math.sqrt(pav())/2
        if(nm1==1||nm2==1)maxtime-=0.25
        setTimeout(run,1000)
    }
    function pause(){
        paused = !paused
        main.style.display = paused?"none":""
        ps.style.display = paused?"":"none"
        pb.textContent = paused?"▶️":"⏸️"
        d = Date.now()
    }
    sm.addEventListener("click",generate)
    pb.addEventListener("click",pause)
    inp.addEventListener("keydown",function(key){
        if(key.key=="Enter"){
            generate(true)
        }
    })
    run()
}