Mixed Reality Game YU-GI-OH

Mixed Reality is a technology that combines the real world with the virtual world. Merging these two worlds will form a new environment where each object from each world can interact with each other. This technology will offer a different user experience depending on how it is used, including digital games. This paper will discuss how to construct the card along with its mechanism of movement that used in YU-GI-OH game and its implementation on mixed reality technology using the HoloLens platform. The game be integrated to HoloLens until view stage


INTRODUCTION
Nowadays, traditional games are losing its charm to video games (Yilmaz et al., 2022).Today's generation are more familiar with video games due to its more appealing graphics.Other reasons are traditional games lack the ability to produce complex audio and animation, the ability to play the game online on the Internet, and the availability to play the games.
Although video games are more attractive than traditional games, not all the videos games are popular to users (Shin, 2019).Several reasons for that are the originality and the complexity of the gameplay (Demaine et al., 2016 ), and the complexity of the graphics that offered by the games.The more original and complex the gameplay, and the more complex the graphics offered by the games, the more popular the games (Martinez and Lambert, 2022).In short, one way to make the games successful is offering new and complex user experience to the user (Granek et al., 2010).Some of the easiest ways to prove that are how many people are downloading and how many positive reviews for the game.There are several numbers of games that have been existed since a few years ago but the user experience offered from the updated version does not have much different from the old version, one of them is YU-GI-OH game (Silva, 2019).In order for YU-GI-OH game to increase the number of people downloading or positive reviews, a significant enhancement in user experience is required compared to previous versions.By using mixed reality technology in YU-GI-OH game, it will revolutionize the game itself.The project in this paper will focus on graphic improvement in YU-GI-OH game by using HoloLens.The paper itself will discuss how to create the cards that are used in YU-GI-OH game in mixed reality form.In this project, the integration of games into HoloLens only reaches game visualization stage in mixed reality form.

Mixed Reality
Mixed reality is the merging of the real and virtual worlds to produce new environments and visualizations, where physical and digital objects coexist and interact in real time (Rusli and Sunar).To produce mixed reality world, it takes three basic components (Kress and Chatterjee, 2020), which are humans, computers, and environment (shown in Figure 1).Mixed reality does not exclusively take place in either the physical or virtual world (Müller et al., 2017), but is a combination of the real world and the virtual world where the combination includes augmented reality and virtual reality using immersive technology (Kaplan et al., 2021).In other word, mixed reality let u interact with and manipulate both physical and virtual items and environments, using next-generation sensing and imaging technologies (Milgram and Kishino, 1994).Fig. 2 shows the spectrum in which mixed reality works.Mixed Reality is the next evolution in human, computer and environmental interactions and opens up the possibilities that were previously limited to our imagination (Pan et al, 2006).This is possible because the advances in computer vision, graphics processing power, display technology, and input systems open boundaries that could not be achieved before (Garon et al., 2016)

YU-GI-OH Trading Card Game
YU-GI-OH is a Japanese manga series about gaming (Papista, 2022) written and illustrated by (see : https://www.yugioh-card.com/en/about/parents_what-is-ygo).The series talk about the main characters (MC) that face some enemies and problems and solve it by playing games.The problems and enemies are different for each series (currently there are 6 series), but the MC always solve it by playing games.At early of first series, various types of games are played.However, the games that played from the middle of first series until the current series become one type, which is YUGI-OH!Duel Monster (Papista, 2022).YU-GI-OH!Duel Monster is a Trading Card Game (TCG) where there are 2 players who have 40 cards in their decks and 4000 life points for each player (Demaine et al., 2016 ).Both players fight in an arena by contesting monster cards, spell cards and trap cards that are owned by each player to reduce the opponent's life point for each turn.A player loses if: • Life Point <= 0 Each player's life point will be reduced when the player receives an attack from an enemy monster or is hit by a spell or trap card.If the player's Life Point becomes 0 or less, the player will lose • Cannot draw card Each turn, one player draws at least 1 card from deck to his hand.If the player cannot draw cards (number of cards on deck = 0), the player will lose.
• Surrender (surrender) The player declares that he cannot continue the game.

Game Popularity
One indication of the success of a game can be seen through the level of popularity of the game (Chung et al).The more popular a game is, the more successful the game.There are many parameters that can be used to measure the level of popularity of a game (Rutz et al., 2019).Among the many parameters, the most common and most easily is the total number of downloads and reviews of the game itself.Table 1 and 2 show the level of popularity of a game with the number of downloads and reviews.The data in these table were collected on October 2018.From the Table 1 and Table 2, it can be seen that the games that enter the top grossing game have a total download and total review far more than the games that do not enter the top grossing game.In other words, the popularity of a game is directly proportional to the number of game downloads and reviews (Zendle et al., 2020).
Also, from the Table 1 and Table 2, it appears that action games are far more popular compared to music games.One reason is that action games have far more complexity than music games (Bustamante et al., 2020 ), so the user experience offered by action games is far more than music games.In other words, the level of popularity of a game will be higher if the user experience offered by the game is more complex (Blow, 2004) Microsoft HoloLens is a mixed reality-based smart glasses developed and produced by Microsoft (Mitsuno et al., 2019).Microsoft HoloLens is also known as the Baraboo Project, where the project is still under development.However, HoloLens was the first headmounted display running the Windows Mixed Reality Platform under the Windows 10 computer operating system (Moro et al., 2021).The result of mixed reality implementation by using HoloLens is shown at

Card Construction
There are 3 types of cards made: How to activate the Effect -✓ ✓

Card Movement Mechanism 1. Card Open
Card open is mechanism of card movement that only happens when the card is in the arena and the face of the card faces up.This mechanism activates the selected card.The activation card has different effects according to the type of card where:

• Monster Cards
Opening the monster card will make the monster summoned (summon) to the arena.• Spell and Trap Cards Opening a spell or trap card activates the effect of the card being opened.

Card Rotation
Card rotation is a mechanism of card movement where the card can only be rotated at the direction 12 o'clock and 9 o'clock.The rotation of the card can only be done by monster cards where: • 12 o'clock position = monsters in attack mode.
This mechanism happens when the game receives input button on the monster card.

Card Flip
Card flip is a mechanism of card movement where the card can only be rotated from a closed (inactive / set) to an open (active / activation) state.Flip cards can only be done when the game input button on the closed card only.

SYSTEM IMPLEMENTATION
There are several points that will be achieved in this project:

Monster Card
There are seven variables that is needed in order to construct monster card.The variable is shown at Figure 8 and Figure 9 show the monster card that already has been constructed.Monster card has "monster shape" variable.This variable includes the monster design in 3D form and the animation while the monster is attacking the enemies.All monsters in this project only have monster design, excluding "Red Eyes Black Dragon" which already has monster design and attacking animation.Fig 17,18,and 19 show "monster shape" variable for by using "Red Eyes Black Dragon" Data.All the movement mechanism for monster card can be run and have no issue during running the mechanism.This means the monster card is ready to use in 2D platform.However, the 3D monster shape is still in simple form and the monster still doesn't have attacking animation, excluding "Red Eyes Black Dragon" monster.However, this card can be integrated in HoloLens although it is only in view stage.
A. Spell Card There are four variables that is needed in order to construct spell card.The variables are shown at Table 3. Figure 20 and Figure 21 show the spell card that already has been constructed.All the movement mechanism for trap card can be run and have no issue during running the mechanism.This means the trap card is ready to use in 2D platform.However, the 3D trap card effect is still in simple form (Nasri et al., 2020).This card also can be integrated in HoloLens although it is only in view stage.The view stage for this project is shown in Fig. 32.

Figure 1 :Figure 2 :
Figure 1 : The Form of Mixed Reality Card Game adapt YU-GI-OH!Duel Monster.Either the traditional types or the video games types, the gameplay follows the YU-GI-OH!Duel Monster with a DOI: https://doi.org/10.17509/seict.v3i2p-ISSN 2744-1656 e-ISSN 2774-1699 few changes.Although this game is one of the famous game series, the user experience offered by the newer version is not much different from the older version (Chagas et al., 2020).The improvement for each series is either change slightly the gameplay, or improve the game graphic (but the game still in 2D form).Fig. 3, 4, 5, and 6 show the game changes in each series (These figures limited only for the games that adapt YU-GI-OH!Duel Monster and release not only in Japan).

Figure 28 and
Figure29show how every trap affect the card appearance.

TABLE II .
Top 3 grossing game (genre: music) in Google Play Store.

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Monster CardsMonster cards are cards used to summon monsters to the arena.Monster cards are used to attack opponents or defend against opponents' attacks.

Table 3 .
Card construction variables