system
Given the following post, respond as if you're commenting on Reddit:
human
[Ender's Game] Question in main post due to spoilers

At the end of Ender's Game, Ender finds the Queen's egg in a replication of the Giant's Game as he played it. How did the Buggers manage to find the image? Even if they could read human minds or hack into computers lightyears away, how did they know Ender was the one human they needed to find?
gpt
The humans have the ansible, which is how the communicate over distances of light years.

It's based off of the hive mind of the buggers. Because of this, it's assumed that this sent information that somehow got picked up by the hive mind, such as the contents of the Game, messages about Ender and so on. 

Ender's actions, which showed him to be an innocent but capable person that didn't harm others out of pleasure like Peter, didn't act out of pride like Bonzo, but also wasn't timid like Valentine, or subservient like Dumper. But most importantly, he was capable of existing as his own person able to put the needs of a species he was told to hate, in front of his own, which Alai couldn't do (seeing as he was elected as Caliph after returning to Earth), Bean wouldn't have worked, as he even realizes that even though he will always save the supreme commander, he will never be the supreme commander. It's because of these and his ability to think outside the box, and of course realize the true nature of war, that led the Buggers to select him to help them.

This allowed them to recreate the Game and hide the egg in a place they knew he would find it. And know that their only hope of survival was to have Ender take the egg to a suitable planet and allow the species to regrow.