N-1441 and the RFG zone

[AnbuKabuto]

When i deploy Tobi (N-1441), i then choose a card from my deck and remove it from the game until he leaves play, but it does not say to reveal it. i guess my question would be is the remove from game pile a revealed zone like the discard pile that my opponent can look through, or is it a hidden zone? i guess to put it in simpler terms, can my opponent see the card that i chose to remove from the game? thank you for your time