<style>
  /* Hide default triangle marker on summary */
  .reveal > summary { list-style: none; cursor: pointer; }
  .reveal > summary::-webkit-details-marker { display: none; }

  /* Layout: overlay the summary button on the image */
  .reveal { position: relative; display: block; }
  .reveal summary {
    position: absolute; inset: 0;
    display: grid; place-items: center;
    background: rgba(255,255,255,0.08);
    border-radius: 0.75rem; /* match rounded-lg */
    z-index: 2;
  }
  /* Button look */
  .reveal summary span {
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    background: rgba(0,0,0,0.5);
    color: #fff; font-size: 0.9rem; letter-spacing: .04em;
    padding: .4rem .7rem; border-radius: .5rem;
  }

  /* Blur image until opened */
  .reveal:not([open]) img {
    filter: blur(10px) brightness(0.85);
    transition: filter .25s ease;
  }
  .reveal[open] summary { display: none; } /* hide overlay once opened */
</style>
<p>Can you turn a straight line of equal triangles into a clean hexagon in <strong>exactly three moves</strong>?</p>
<div class="mt-4 grid grid-cols-1 sm:grid-cols-2 gap-4">
  <figure class="bg-white/70 rounded-xl shadow p-3">
    <img src="/hex2.png" alt="Start — line of triangles (Structure A)" class="w-full h-auto rounded-lg">
    <figcaption class="text-sm text-gray-600 mt-2">Start (Structure A): Line of triangles</figcaption>
  </figure>
  <details class="reveal bg-white/70 rounded-xl shadow p-3">
    <summary aria-label="Reveal step hex3"><span>Click to reveal</span></summary>
    <figure>
      <img src="/hex3.png" alt="After Move 1" class="w-full h-auto rounded-lg">
      <figcaption class="text-sm text-gray-600 mt-2">After Move 1</figcaption>
    </figure>
  </details>
  <details class="reveal bg-white/70 rounded-xl shadow p-3">
    <summary aria-label="Reveal step hex4"><span>Click to reveal</span></summary>
    <figure>
      <img src="/hex4.png" alt="After Move 2" class="w-full h-auto rounded-lg">
      <figcaption class="text-sm text-gray-600 mt-2">After Move 2</figcaption>
    </figure>
  </details>
  <figure class="bg-white/70 rounded-xl shadow p-3">
    <img src="/hex5.png" alt="Goal — hexagon after three moves (Structure B)" class="w-full h-auto rounded-lg">
    <figcaption class="text-sm text-gray-600 mt-2">Goal (Structure B): Hexagon after 3 moves</figcaption>
  </figure>
</div>
<details class="mt-4">
  <summary class="cursor-pointer font-medium">Hint (tap to reveal)</summary>
  <p class="mt-2 text-gray-700">Create a small “V” in the middle on the first move; the last two moves close the ring.</p>
</details>
<p class="mt-2 text-gray-700">
  For more interesting puzzles, visit
  <a href="https://trixelverse.com/puzzles" class="underline">
    trixelverse.com/puzzles
  </a>
</p>

Line → Hexagon (in 3 moves)

Why Triangles Build Better Minds

Why Modular Play Is the Language of the Future

The deep spatial sense behind numbers

Everyday ways to grow spatial brains (for parents & teachers)

Can you really train spatial skills?

Spatial Intelligence 101: Why it Matters

Equilateral vs. Isosceles: Two Pillars of Geometry

Line → Hexagon

Line → Hexagon (in 3 moves)

Ready to think in triangles?

// BLOG ARCHIVE