JSFiddle - React, Tailwind, and code Playground

HTML

<button type="button" id="a">start</button>
<div class="x1">
    <div>
        <input type="text" id="c1">
        <button type="button" id="b1">stop</button>
    </div>
    <div>
        <input type="text" id="c2">
        <button type="button" id="b2">stop</button>
    </div>
    <div>
        <input type="text" id="c3">
        <button type="button" id="b3">stop</button>
    </div>
</div>

CSS

input {
    width:1em;
    font-size:30px;
    text-align:center;
}
button {
    width:40px;
}
.x1 {
    padding:10px 0;
}
.x1 div {
    float:left;
    width:50px;
    text-align:center;
}

JavaScript

var a = document.getElementById('a');
var b1 = document.getElementById('b1');
var b2 = document.getElementById('b2');
var b3 = document.getElementById('b3');
var c1 = document.getElementById('c1');
var c2 = document.getElementById('c2');
var c3 = document.getElementById('c3');
var t1 = null;
var t2 = null;
var t3 = null;

function start() {
    if (t1) {
        clearInterval(t1);
    }
    if (t2) {
        clearInterval(t2);
    }
    if (t3) {
        clearInterval(t3);
    }
    c1.value = Math.floor(Math.random() * 10);
    c2.value = Math.floor(Math.random() * 10);
    c3.value = Math.floor(Math.random() * 10);
    t1 = setInterval(function () {
        c1.value = (+c1.value + 1) % 10;
    }, 200);
    t2 = setInterval(function () {
        c2.value = (+c2.value + 1) % 10;
    }, 200);
    t3 = setInterval(function () {
        c3.value = (+c3.value + 1) % 10;
    }, 200);
}

function stop1() {
    if (t1) {
        clearInterval(t1);
        t1 = null;
    }
    check();
}

function stop2() {
    if (t2) {
        clearInterval(t2);
        t2 = null;
    }
    check();
}

function stop3() {
    if (t3) {
        clearInterval(t3);
        t3 = null;
    }
    check();
}

function check() {
    if (!t1 && !t2 && !t3) {
        if (c1.value == c2.value && c1.value == c3.value) {
            alert('あたり！');
        } else {
            alert('はずれ！');
        }
    }
}

a.addEventListener('click', start);
b1.addEventListener('click', stop1);
b2.addEventListener('click', stop2);
b3.addEventListener('click', stop3);

start();