MathExplained.github.io/crossword.html at main · MathExplained/MathExplained.github.io · GitHub

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<!DOCTYPE html>
<htmllang="en">

<head>
<metacharset="utf-8" />
<metaname="viewport" content="width=device-width,initial-scale=1" />
<title>Crossword - MathEXplained</title>
<metaname="description" content="Play the official MathEXplained crossword. Every monthly puzzle, with solutions." />
<linkrel="icon" href="assets/favicon.ico" type="image/x-icon">
<linkrel="preconnect" href="https://fonts.googleapis.com">
<linkrel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<linkrel="stylesheet"
href="https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400..700&family=Inter:wght@400..700&display=swap">
<linkrel="stylesheet" href="./style.css">
<linkrel="stylesheet" href="https://unpkg.com">

<!-- Pre-rendered SVG for the decorative background; no MathJax runtime needed. -->
<scriptsrc="math-symbols.js" defer></script>
<scriptsrc="background.js" defer></script>
<scriptsrc="site.js" defer></script>
</head>

<bodyclass="crossword-page with-header-gap">
<!-- icons:start (generated by tools/build-icons.mjs) -->
<svgxmlns="http://www.w3.org/2000/svg" hiddenaria-hidden="true">
<symbolid="i-search" viewBox="0 0 24 24"><pathd="m21 21-4.34-4.34" /><circlecx="11" cy="11" r="8" /></symbol>
<symbolid="i-x" viewBox="0 0 24 24"><pathd="M18 6 6 18" /><pathd="m6 6 12 12" /></symbol>
<symbolid="i-arrow-up" viewBox="0 0 24 24"><pathd="m5 12 7-7 7 7" /><pathd="M12 19V5" /></symbol>
<symbolid="i-arrow-left" viewBox="0 0 24 24"><pathd="m12 19-7-7 7-7" /><pathd="M19 12H5" /></symbol>
</svg>
<!-- icons:end -->
<aclass="skip-link" href="#main">Skip to content</a>
<canvasid="proximity-grid" aria-hidden="true"></canvas>
<divclass="math-bg-layer" aria-hidden="true"></div>
<divclass="announcement-banner">📣 Join our Google Group for exclusive email updates! <ahref="https://groups.google.com/g/mathexplained-magazine-releases" target="_blank">Learn more...</a></div>
<headerclass="headerbar">
<aclass="brand" href="index.html">
<imgsrc="assets/logo.webp" width="48" height="48">
<spanclass="site-title">Math<spanclass="accent">EX</span>plained</span>
</a>
<navclass="nav-right" aria-label="Primary">
<ahref="index.html">Past Releases</a>
<ahref="about_us.html">About Us</a>
<ahref="staff.html">Staff</a>
<ahref="crossword.html">Crossword</a>
<ahref="apply.html" class="nav-cta">APPLY!</a>
<ahref="https://discord.com/invite/Fnhwbzfpfz" target="_blank" class="navlink">
<imgsrc="https://cdn.jsdelivr.net/gh/simple-icons/simple-icons/icons/discord.svg" alt="Join us on Discord" class="discord-icon">
</a>
<ahref="https://www.instagram.com/mathexplainedmagazine" target="_blank" class="navlink">
<imgsrc="https://cdn.jsdelivr.net/gh/simple-icons/simple-icons/icons/instagram.svg" alt="Follow us on Instagram" class="instagram-icon">
</a>
</nav>
</header>

<mainclass="container crossword-container" id="main" role="main">
<h1>MathEXplained Official Crossword Player</h1>

<!-- Top controls row: select left-ish, buttons right -->
<divclass="cw-top-controls">
<divclass="cw-select-wrap">
<labelfor="problemSelect" class="sr-only">Select problem set:</label>
<selectid="problemSelect" aria-label="Select problem set"></select>
</div>
<divclass="cw-btn-group">
<buttonid="checkBtn" type="button" class="cw-btn cw-btn-check">Check</button>
<buttonid="clearBtn" type="button" class="cw-btn cw-btn-clear">Clear</button>
<buttonid="giveUpBtn" type="button" class="cw-btn cw-btn-giveup">Give Up</button>
</div>
</div>

<!-- Main two-panel layout -->
<divclass="cw-main-layout">

<!-- LEFT: Problem PDF viewer -->
<divclass="cw-pdf-panel">
<divclass="cw-pdf-label">Problems</div>
<iframe
id="problemPdfFrame"
class="cw-pdf-iframe"
title="Problem PDF"
aria-label="Problem PDF viewer"
></iframe>
</div>

<!-- RIGHT: Interactive crossword grid -->
<divclass="cw-grid-panel">
<divclass="grid" aria-label="2x2 crossword grid">
<divclass="cell">
<spanclass="cell-number">1.</span>
<inputid="c0" inputmode="text" autocomplete="off" aria-label="cell 1">
</div>
<divclass="cell">
<spanclass="cell-number">2.</span>
<inputid="c1" inputmode="text" autocomplete="off" aria-label="cell 2">
</div>
<divclass="cell">
<spanclass="cell-number">3.</span>
<inputid="c2" inputmode="text" autocomplete="off" aria-label="cell 3">
</div>
<divclass="cell">
<inputid="c3" inputmode="text" autocomplete="off" aria-label="cell 4">
</div>
</div>
</div>

</div><!-- /.cw-main-layout -->

<!-- Status text -->
<divclass="status" id="statusText" aria-live="polite"></div>

<!-- Solution PDF viewer — shown on win OR give up -->
<divid="solutionBox" class="cw-solution-panel" role="region" aria-label="Solutions" style="display:none;">
<divclass="cw-pdf-label">Solutions</div>
<iframe
id="solutionPdfFrame"
class="cw-pdf-iframe cw-solution-iframe"
title="Solution PDF"
aria-label="Solution PDF viewer"
></iframe>
</div>

</main>

<footer>
<divclass="footer-top">
<divclass="footer-brand">
<imgsrc="assets/logo.webp" width="48" height="48">
<divclass="site-title">Math<spanclass="accent">EX</span>plained</div>
<pclass="footer-tagline">A student-run magazine making mathematics readable &mdash;
 one monthly issue at a time.</p>
</div>
<divclass="footer-links">
<divclass="footer-col">
<h4>Explore</h4>
<ul>
<li><ahref="index.html">Past Releases</a></li>
<li><ahref="crossword.html">Crossword</a></li>
<li><ahref="about_us.html">About Us</a></li>
<li><ahref="staff.html">Staff</a></li>
</ul>
</div>
<divclass="footer-col">
<h4>Get involved</h4>
<ul>
<li><ahref="apply.html">Apply to join</a></li>
<li><ahref="https://groups.google.com/g/mathexplained-magazine-releases"
target="_blank" rel="noopener">Mailing list</a></li>
<li><ahref="https://discord.com/invite/Fnhwbzfpfz"
target="_blank" rel="noopener">Discord</a></li>
<li><ahref="https://www.instagram.com/mathexplainedmagazine"
target="_blank" rel="noopener">Instagram</a></li>
</ul>
</div>
</div>
</div>
<p>&copy; 2026 MathEXplained. All rights reserved.</p>
</footer>

<scriptsrc="crossword_data.js"></script>
<script>
(function(){
letcurrent=0;
letPATH="assets/crossword_pdfs/";

constproblemSelect=document.getElementById('problemSelect');
constproblemPdfFrame=document.getElementById('problemPdfFrame');
constsolutionPdfFrame=document.getElementById('solutionPdfFrame');
conststatusText=document.getElementById('statusText');
constsolutionBox=document.getElementById('solutionBox');
constinputs=[0,1,2,3].map(i=>document.getElementById('c'+i));
constcheckBtn=document.getElementById('checkBtn');
constclearBtn=document.getElementById('clearBtn');
constgiveUpBtn=document.getElementById('giveUpBtn');

/* ── Populate select ── */
functionpopulateSelect(){
crosswordData.forEach(function(entry,idx){
varo=document.createElement('option');
o.value=idx;
o.textContent=entry.name;

if(entry.disabled){
o.disabled=true;
}
problemSelect.appendChild(o);
});
}

/* ── Load PDFs for selected month ── */
functionloadEntry(){
varentry=crosswordData[current];
problemPdfFrame.src=PATH+entry.problemPdf;
clearGrid();
}

/* ── Clear grid + hide solution ── */
functionclearGrid(){
inputs.forEach(function(inp){inp.value='';});
statusText.textContent='';
solutionBox.style.display='none';
solutionPdfFrame.src='';
}

/* ── Show solution PDF ── */
functionshowSolution(){
varentry=crosswordData[current];
solutionPdfFrame.src=PATH+entry.solutionPdf;
solutionBox.style.display='block';
solutionBox.scrollIntoView({behavior: 'smooth',block: 'start'});
}

/* ── Check answers ── */
functioncheckWin(){
varentry=crosswordData[current];
varallFilled=true;
varallCorrect=true;

for(vari=0;i<4;i++){
varuser=(inputs[i].value||'').trim();
if(user==='')allFilled=false;
if(user!==entry.answer[i])allCorrect=false;
}

if(allCorrect&&allFilled){
statusText.textContent='🎉 You win!';
showSolution();
}else{
statusText.textContent='🚫 Incorrect — keep going!';
solutionBox.style.display='none';
}
}

/* ── Give Up ── */
functiongiveUp(){
statusText.textContent='😔 Better luck next time!';
showSolution();
}

/* ── Input behaviour ── */
inputs.forEach(function(inp,i){
inp.setAttribute('maxlength','1');

inp.addEventListener('input',function(e){
varcleaned=(e.target.value||'').toUpperCase().replace(/[^A-Z0-9]/g,'').slice(0,1);
e.target.value=cleaned;
if(cleaned){
inputs[(i+1)%inputs.length].focus();
}
});

inp.addEventListener('keydown',function(e){
if(e.key==='Enter'){
e.preventDefault();
checkWin();
}elseif(e.key==='ArrowRight'){
e.preventDefault();
inputs[(i+1)%inputs.length].focus();
}elseif(e.key==='ArrowLeft'){
e.preventDefault();
inputs[(i-1+inputs.length)%inputs.length].focus();
}elseif(e.key==='ArrowDown'){
e.preventDefault();
inputs[[2,3,0,1][i]].focus();
}elseif(e.key==='ArrowUp'){
e.preventDefault();
inputs[[2,3,0,1][i]].focus();
}
});
});

/* ── Wire buttons ── */
problemSelect.addEventListener('change',function(){
current=Number(problemSelect.value);
loadEntry();
});
checkBtn.addEventListener('click',checkWin);
clearBtn.addEventListener('click',clearGrid);
giveUpBtn.addEventListener('click',giveUp);

/* ── Init ── */
populateSelect();
problemSelect.value=0;
loadEntry();
})();
</script>
</body>
</html>