What is an experimental world, and how does it work?
<p><span lang="en" style="-webkit-tap-highlight-color:transparent; background-color:#f5f5f5; color:#000000; display:inline; font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif; font-size:18px; font-style:normal; white-space:pre-wrap" class="VIiyi"><span data-language-for-alternatives="en" data-language-to-translate-into="es" data-phrase-index="0" style="-webkit-tap-highlight-color:transparent; background-color:#d2e3fc; cursor:pointer" class="ChMk0b JLqJ4b"><span style="-webkit-tap-highlight-color:transparent">Currently Currently, there are 2 experimental worlds that are "blocked" for the entrance and exit of characters, which are "Zuna" and "Zunera", what is special about these worlds?</span></span></span><span style="background-color:#f5f5f5; color:#000000; font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif; font-size:18px; white-space:pre-wrap"> </span></p>worlds?