What secret feature makes LEGO sets better together?

The provided snippet indicates there’s an article claiming that 12 LEGO sets include a “secret feature” designed to make builds more fun with friends, with sets starting at $19. However, the content itself is not visible in the text you provided (access was denied due to automation/Javascript restrictions), so the specific feature can’t be confirmed.

What we can say from the available info

• The sets are positioned as more enjoyable to build with friends.
• The lineup includes 12 different LEGO sets.
• The price framing starts at $19, implying some options are aimed at lower budgets.

What we can’t verify here

Because the article’s details are blocked, it’s still unclear:

• What the secret feature actually does (e.g., special connectors, collaborative minifig mechanics, or build instructions that require more than one person).
• Which specific sets include it.
• Whether the feature differs by theme or only applies to select bundles.

If you can share the text of the feature description (or the names of the sets involved), I can summarize the exact mechanism and why it matters for collaborative building.