Duel Disk 1

During the Duelist Kingdom arc, Seto Kaiba developed the first generation duel disk prototypes as a means of countering Pegasus' mind reading techniques. Seto gambled that Pegasus needed face to face contact for his mind reading to word so as a feature of the disks, holographic projections of the cards obstruct the duelists from seeing each other.

This duel disk was physically and fuctionally different than the ones that would follow. Where the others are a single piece construct which houses the deck, graveyard, life point counter and cards in play, The first Duel Disk system had two components joined by a retractable cable, The wrist component houses the deck and life point counter, and the actual disk component holds 5 cards. Users would load the cards as explained later into the disk and throw it yo yo style, causing hologram to be progected from it.

The duel disk system also changed the rules of Duel Monsters. They followed Duelist Kingom rules except for the following changes.

Both players draw cards until they have 5 in their "hand". If they have 5 then can draw no more.

One monster card is placed on the "Main card stage", the centre place on the disk. This can be in Attack or Defence position.

The other 4 cards are placed face down into the other places, the "Sub card stage".

The players can only attack with the monster in the main card stage, providing it is in attack position first. It can attack the opponent's main card stage monster or one of the sub stage cards.

Any monsters in the sub card stage are considered to be in attack position, and damage calculation is done accordingly. Spell and trap cards are destroyed with no calculation done.

The players may shuffle their sub card stages at their discreation.