Who says all Halloween fun has to happen on land? This spooky season, Biggo Blocks is diving deep for some ocean-inspired fun. Imagine creepy coral caves, pumpkin-colored sea creatures, and mysterious underwater glow — all built from your favorite blocks!
With Mega Sets, kids can go beyond simple builds and create full underwater scenes, from haunted reefs to pirate shipwrecks guarded by spooky sea monsters. It’s a mix of marine magic and Halloween creativity that’s perfect for curious little builders.
The Blocktopus: A Tentacled Treat
Our first star of the sea is the mighty Blocktopus, a big, colorful octopus with eight bendy arms made from stacked jumbo blocks.
Start with a wide circular base for the head, then layer upward using bright purples, greens, and orange pieces for that Halloween vibe. Each tentacle can curve outward or twist up — the bigger your Mega Set, the more arms you can add!
💡 Halloween Twist: Give your Blocktopus glowing “eyeballs” with white or yellow blocks, and add a little pirate hat on top for fun! Want to go even creepier? Use dark colors like black and purple to turn it into a deep-sea monster guarding Halloween treasure.
🔧 STEM Tip: Building a balanced, multi-armed design helps kids explore symmetry, stability, and structure.
The Creepy Crab: Cute, Cranky, and Totally Creative
Next up: the Creepy Crab! This lovable crustacean can be as silly or spooky as you want. Build a wide oval base for the body, then use smaller red or orange blocks for claws. Give it wiggly eyes, a funny grin, or even tiny vampire fangs for a Halloween touch.
💡 Halloween Twist: Add a few “ghost bubbles” made from white blocks floating around your crab, or use Mega Sets to create a glowing sandcastle home behind it. You can even give it a name, like Count Crabula!
🔧 STEM Tip: Creating claws and curved shells helps kids experiment with angles and reinforcement.
Build a Haunted Reef
Once your crab and octopus are done, it’s time to set the scene. Use Mega Sets to create an underwater world filled with seaweed, shipwrecks, and glowing coral. Add block-built pumpkins or floating ghost fish to make it Halloween-perfect.
If you’re using multiple sets, try color-blocking each creature and background to create layers — like a mini Halloween aquarium built entirely from Biggo Blocks!
After You Build, Watch Blocky’s Halloween Spoofs!
When you’re done building your spooky sea creatures, kick back and enjoy some laughs with our latest video, Blocky’s Scary Movie Spoofs.
From Frankenblock to BlockSaw, Blocky takes classic horror movie moments and turns them into hilarious, family-friendly block adventures. It’s the perfect way to keep the Halloween fun going after playtime!
Brick or Treat Promo
Want to bring your underwater Halloween builds to life?
Our Brick or Treat savings make it easy to go big this spooky season:
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Buy 1 = 5% off
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Buy 2 = 10% off
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Buy 3+ = 15% off
🧱 Build more, save more — and make this Halloween one to remember.
👉 Shop Brick or Treat Now
When Ocean Meets Halloween
From creepy crabs to haunted reefs, every build tells a story.
Bring Halloween under the sea with Biggo Blocks, where imagination runs deep and creativity never sleeps.
