Yugi Muto completed the Millenium Puzzle and now therefore has an unbeatable alter ego and certain magical powers.
Pegasus is currently in possession of this, though I'm pretty sure Bakura gets it after Yugi beats Pegasus in a duel. The Millenium Eye lets you see what a person is thinking.
This is currently owned by Bakura. This creates an evil alter ego, Yami Bakura. The Millenium Ring can locate other Millenium items and can also control them.
This item is currently owned by Shadi. This item gives you the power to see inside a person's mind and heart.
This item is currently owned by Shadi. If the owner of this asks a person a question, if they don't answer truthfully, the scale will punish them.
Currently owned by Ishtar Malik. This rod can give the owner the ability to control a person's body and mind.
This item is currently owned by Ishtal Isis. Although this item can give the owner the power to see the future, another millenium item could still change that future.
