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separate section for "realistic projections"
** Level 5 and 6 monsters require one sacrifice.<ref name="d d 94" />
** Level 7 or higher monsters require two sacrifices.<ref name="d d 94" />
==Realistic projections of cards==
Multiple methods have been used to create lifelike projections of the cards while playing ''Duel Monsters''.
* Cards have been brought to life by [[Millennium Item]] holders through use of [[Shadow Game]]s.
* [[KaibaCorp]] used holographic technology to create projections of cards to artificially replicate the experience of the Shadow Games. This was mainly done through the use of [[Battle Box|Virtual Simulation Battle Boxes]].
* KaibaCorp later invented [[Solid Vision]], which created even more realistic and life-sized projections of the cards. And invented Duel Disks as as a means of creating the projections from cards.
* KaibaCorp also invented the [[Neurons]] as a means of playing ''Duel Monsters'' in the ''[[Duel Links (manga)|Duel Links]]'' virtual reality.
<gallery widths="300" heights="250">
Ryu-Kishin and Blackland Fire Dragon alive.png | Monsters in a [[Shadow Game]]
Duel Monsters in Battle Box - Dark Yugi VS Kajiki.png | Holograms in a [[Battle Box|Virtual Simulation Battle Box]]
D-027 Jonouchi VS Kaiba.png | [[Solid Vision]] projections from the [[Duel Disk prototype|prototype Duel Disks]]
File:Dark Yugi VS Pandora - face-down buildup.png | Solid Vision projections from the V2 Duel Disks
Crystal Cloud Network.png | Virtual reality created using [[Neurons]]
</gallery>
==History==
''Duel Monsters'' became a huge success in the United States, with players said to be in excess of twenty million and many tournaments hosted with large prizes.<ref name="d 87">{{chapter|Yu-Gi-Oh!|87|ref}}</ref> The game features a number of valuable cards, with one fan in America alleged to have sold his house to pay for a single card.<ref name="d 9" />
Initially "[[Blue-Eyes White Dragon (manga)|Blue-Eyes White Dragon]]" was considered to be one of the most powerful cards, so overpowered that production was ceased, causing it to gain a high monetary among collectors.<ref name="d 9" /> Four copies were known to exist. They fell into the hands of collectors in the United States, Germany, and Hong Kong and [[Sugoroku Mutou (manga)|Sugoroku Mutou]] in Japan.<ref name="d 27">{{chapter|Yu-Gi-Oh!|27|ref}}</ref>
===Introduction of holograms===
[[Seto Kaiba (manga)|Seto Kaiba]]'s attempt to steal the "Blue-Eyes White Dragon" from [[Sugoroku Mutou (manga)|Sugoroku Mutou]] resulted in him being challenged to a [[Shadow Game]] of ''Duel Monsters'' by [[Dark Yugi (manga)|Dark Yugi]]. In this game, the monsters came to life as they were Summoned.<ref name="d 9" /> On defeat, Kaiba was subjected to a [[Penalty Game]], resulting in him imagining he was trapped inside a card, causing him to reside in the [[Duel Monsters Spirit World|World of Duel Monsters]], where he suffered the [[Experience of Death]] at the hands of monsters.<ref name="d 10" />
Kaiba invented the [[Battle Box|Virtual Simulation Battle Boxes]], which created 3-D holograms of cards, as players played ''Duel Monsters'', recreating what he witnessed in the Shadow Game. And allowed him to inflict a reconstruction of the Experience of Death on the loser.<ref name="d 27" />
Battle Boxes were used during [[Death-T]] and [[Duelist Kingdom]].
====Introduction of Solid Vision====[[File:D-027 Jonouchi VS Kaiba.png|thumb|right|300px|''Duel Monsters'' brought to life using [[Solid Vision]] via [[Duel Disk]]s]]
[[Duel Disk]]s were developed later by KaibaCorp as a more upgraded means of Dueling that the Battle Boxes. Kaiba was in some part incentivized to develop them having witnessed the mind-reading abilities that the [[Millennium Eye]] granted Pegasus. The Duel Disks required players to stand at least 5 meters apart, which Kaiba hoped would be enough to put him out of Pegasus' [[Mind Scan]]'s range. Unlike Battle Boxes the Duel Disks used [[Solid Vision]], which created life-sized projections<ref>{{chapter|Yu-Gi-Oh!|85|ref}}</ref> and were considered to be much more realistic than the holograms used by the Battle Boxes.<ref name="d 133">{{chapter|Yu-Gi-Oh!|133|ref}}</ref>
