Ease 1 Deluxe
Portal Pieces are a powerful artifact that grants evil wishes by opening a portal to another dimension and lets monsters into Kenuo and ease must go collecting them throughout the game. It is possible to defeat the final boss without all 9 portal pieces however this will lead to a false ending.
The stones Highly resemble Portal pieces
If a player collects all 40 keys they will open the portal to the monstrous world and fight Ifei as a bonus ending
Portal pieces are seen as 2 varieties in Ease 15
After you defeat the three guardians of the Dark sun you will be sent to the second portion of the game where you must collect all 9 portal pieces
Golden Portal Piece
After you collect all 9 portal pieces, The creator will appear and say all the portal pieces were fake and he fused the real ones into a golden portal pieces then you have a showdown with The creator on KimStone Rock