it's a collection of 6 games that've been out on the GBA and the DS systems, it was pretty enjoyable, the ZX series wasn't as fun as the zero series, I had fun with both games though and I love leviathan in the zero games, but zero 4 was very badly executed and so was the fates of the three guardians at the end of zero 3 until the creator was just like oh yeah they died at the end of the battle in the explosion shielding zero. That was a awful decision, he killed off 3 great characters in such a confusing way that nobody knew they died. But zero 1-3 were great aside from that terrible choice. 4 was ok but it was poorly done when half the cast doesn't even pop up. ZX was pretty enjoyable but ZX advent kind of felt like a downgrade and they added voices which kind of was annoying since the voice acting is bad and I'd rather just read the text and imagine them with better voices lol. plus they make you play as new characters instead of the girl and boy from the first ZX. It was pretty decent though how in the ZX series, they allowed us to actually transform into the bosses we defeated. I'd rate this collection a 6/10.