Maximilian Fink

With this plugin you can decorate your site for Halloween with just one click – an Easter Egg that will delight your visitors! 
There is an options page under settings where you can activate and throttle spiders and flies. These will appear on the page and crawl across the screen in a very real way. A spooky affair perfect for Halloween.

Simple Halloween Decoration For Your Page

I love this plugin! the plugin is perfect for halloween and and easy to use. just check the checkboxes on the options page and the site is ready for the halloween night! 100% free of charge and free of advertising - awesome!

I Love it!!!!

The plugin simply adds spiders and bugs that run across your site - the perfect halloween-decoration for your site!

Marat Nepomnyashy

Overview:
At the time of this writing, the latest version of WordPress, version 4.7, 
 has functionality to discourage search engines from indexing the whole site, 
 but not functionality to discourage search engines from indexing only certain 
 specific pages and posts of the site.
Robots Meta Whiz is a WordPress plugin that allows site administrators to 
 deploy custom meta robots tags to discourage search engines from indexing, 
 following links from, caching, indexing images from, and / or have 
 additional custom restrictions on only for certain specifically-designated 
 pages and posts.
It is an easy way to discourage search engines from indexing only specific 
 pages / posts.
This only applies to search engine robots, and will not effect the site’s 
 local search functionality.
Technical summary:
Plugin works by hooking-in special logic into the action ‘wp_head’ to inject 
 the tag <code><meta name='robots' content='...'></code> with restriction directives for 
 the specified pages and posts.
Official project URLs:
https://wordpress.org/plugins/robotswhiz 
 https://github.com/maratbn/RobotsWhiz

Robots Meta Whiz

Easy way to discourage search engines from indexing only specific pages / posts with custom meta tags.

Simple Halloween Decoration For Your Page vs Robots Meta Whiz