There is one lost zone made up of two piles total - one for each player - to not confuse one's cards with another's I think.
Each player would have their own 'lost zone' for their own cards just like they each have a discard pile.
There is one lost zone made up of two piles total - one for each player
each player has their own (section of the) Lost Zone.
The PTCGO only has one pile for Lost Zone cards which both players share, which makes it even more confusing. What if a card was introduced in the future that allowed you to return your Lost Zone'd cards to your hand or deck? How would the game be updated to accommodate that?
What if a card was introduced in the future that allowed you to return your Lost Zone'd cards to your hand or deck?