If you haven't read Ender's Shadow, read it now. It opens up a new perspective on Ender's Game and is just soooo very good. The later books in that series are eh... but Ender's Shadow is one of my all time favorites.
Thx +Chris Coomber. I am considering skipping part 3 + 4 of the Ender series and continue with Ender's Shadow. But it has to wait a bit. Right now I am reading the Dark Tower series by Stephen King. I have read (and loved) the first 2 books when I was young and want to find out if I still like it :)
+Tobias K , oops! Sorry. I thought you were talking about Ender's Shadow. For Ender's Game, it's Speaker for the Dead, Xenocide, then Children of the Mind. I only read Speaker for the Dead and stopped after that, but if you liked Ender's Game, go for Ender's Shadow. It happens during the exact same time as Ender's Game, but just through Bean's perspective.
+Tobias K I agree with +Ronica Voelker read Enders Shadow next. Then choose to either follow the ender series or the shadow series, both tie together at certain points. There is a diagram showing how they tie together on the enders game series wikipedia page, on mobile at the moment so it's difficult to link it. Whatever you decide enjoy :-)