has seen extensive use in the designation and evaluation of games and game-like experiences,as

well as other related areas. Besides,the GameFlow model has been used to design and evaluate

games for a variety of platforms, including mobile games [3, 4],console games [5], and VR games

[6]. New models have been derived from the original GameFlow model, including EGameFlow [7],

MIU-GameFlow [8]and Pervasive GameFlow [9]. The GameFlow model has also been evaluated in

the literature. The inclusion of the Social Interaction element has been argued and tested [10]. There

are other researches like the GameFlow model’s connection to flow [11]and the relationship

between Social Interaction and Immersion[12].

Similar to loot boxes, in gacha games, players pay virtual currency which is bought with real money

have become an integral part of worldwide mobile game culture. Some famous gacha games can be

turned into highly profitable IP in ACGN industry. Despite the many uses and applications of the

GameFlow model, there is little research that attempts inquiry into the field of gacha games. Given

the prevalence and significance of gacha mechanics, it is important to take gacha mobile games into

consideration discussing GameFlow model.

criteria are shown in gacha mobile games taking Arknights for example, as well as experience for

designing similar gacha games to enhance enjoyment.

referred to as CNG or CNG( New Game Research) is a Chinese research institute specializing in

video games, movies and television programmes. According to Gamma Data’ s 2019 discovery,the

revenue of Arknights for the first month after the release was over 600 million RMB, which turns to

be a great success for a newborn gacha game.

gacha standards. Arknights made $170M net of apple/google fee from Nov.2019 to Nov.2020. This

excludes revenues made in China, with probably add another 30 to 50%. Revenues from western

countries are around $30M, with $22M in the US alone. Strong asian market and successful global

launch means Arknights is just beginning its exploitation phase. Four years later, Arknights is still

going strong. According to Sensor Tower,until May 2023, Arknights’ total overseas income has

comics, games and novels is a traditional and irresistible method for successful promotion of an IP

in the field of cultural industry. Arknights features its own soundtrack, which includes background

musics and promotional music or songs produced specifically for the game. Ambience Synesthesia

is a series of real-world concerts featuring Arknights' music, held under the oversight of

Hypergryph (as Monster Siren Records) since 2021. It has already been a a auditory banquet for

players very year with high incomes and reputation. Ambience Synesthesia 2023 Wanted has won

the Hollywood Music in Media Awards

HMMA

under Live Concert for Visual Media.

disaster known as the Originium has caused a global collapse of civilization, leading to the

resembles the homo sapiens of earth, but with physical traits from various animals, legendary

creatures, and mythological beings. They can be considered humanoid or anthropomorphic. These

are Operators. Arknights utilizes a gacha system for players to obtain the Operators.

factors of Arknights as a mobile gacha game with GameFlow. The following two aspects may

account for the success of Arknights.

challenging and match players’ skill[1]. Games should provide different levels of challenge for

players of different levels. Through the game playing, players should experience progresses and

increase their skills. In the case of Arknights, the strategy of distributing missions reaches the

famous Genshin Impact is of open-world action role-playing. As for Arknights, it is tower defense.

or possessions by obstructing the enemy attackers or by stopping enemies from reaching the exits,

usually achieved by placing defensive structures on or along their path of attack.This typically

means building a variety of different structures that serve to automatically block, impede, attack or

destroy enemies. Tower defense is seen as a sub-genre of real-time strategy video games, due to its

real-time origins, even though many modern tower defense games include aspects of turn-based

strategy. Strategic choice and positioning of defensive elements is an essential strategy of the genre.

Arknights is the first popular gacha games utilizing tower defense. It is common sense that tower

defense is a kind of rather challenging game genre which means Arknights can deal with mission

difficult than the run-of-the-mill tower defense game due to tricky maps and enemy design, and

provides challenging combat puzzles. A strong aspect of the game is the management of the player's

Operators and correct use of their abilities to achieve victory. Arknights also features the important

base building feature. Arknights utilizes a gacha system for players to obtain the Operators.

However, the game has designed stages to be solvable using Operators of the most common rarities.

Additionally, the Recruitment system permits the free, albeit rare acquisition of most of the oldest

high rarity Operators.

solution to beat it. The characters that players can roll for in the gacha system are the units they

six-star unit because they just make things easier. Thus, it is not necessary for ordinary players to

spend money on gacha system.

2.2.2 Complexity Management in Arknights

complexity is likely to mean that the workings of the games or simulations are harder to

understand.[16]But Arknights has a delightful complexity management. For players, there is

something satisfying about being stumped on a hard level, not knowing how to beat a new boss or

get past a certain wave of enemies, and then figuring it out. Besides, the game does not see new

levels or events often, so that downtime can be used to take a break from the game or farm materials

to power up characters.The steady addition of new content is reasonable, and potentially a little

overwhelming if players invest in the optional character interludes. Arknights keeps a fairly

reasonable requirement for engagement without feeling overly burdensome.

(Shining's Theme) is a symphonic piece with Latin chorus.Autumn Moods (Angelina’s Theme) is

Light's boss theme track. Arknights soundtrack has also attempted something more like an an

anthem piece straight out of a musical like Towards Her Light (Saileach's theme) and Silver Lining

(Silver Ash's theme). Furthermore, Hypergryph takes the time and makes the effort to ensure that

every event and so on gets its own music. It ensures that the music in question fits the theme of the

event. This is not just lobby music, but also the music in the stages themselves.

a variety of countries and regions on Terra which have their own archetype in real history. For

special events.The main story begins with the Chernobog crisis. The Ursine nomadic city of

Chernobog is currently suffering a bloody riot led by Reunion Movement, a pro-Infected violent

non-state organization. The chaos has spread across the city, and no one could escape from that.

And a Catastrophe is on the road. Rhodes Island is involved in the riot trying to resolve any issue

with peace by stopping the riot. And their first and foremost goal was to get the Doctor out from the

city.

game. With its unique blend of strategy gameplay and engaging storytelling, high-profile music and

skillful art-style, Arknights has attracted players’ concentration and immersion, earning it critical

acclaim and a loyal fan base.

mobile game market is very fierce at the same time. Gacha products with high quality come out and

enter the market one by one. It seems that every game can gain lots of attraction and pretty incomes

at the very beginning while it is hard for them to survive a rather long lifespan. But Arknights has

made it. In every sense, it has become one of the most successful gacha and new IP launched in the

recent years which enjoy high reputation and incomes.

and are often compared to gambling. But it is difficult to deny that gacha game has already become

an important part of game culture and industry worldwide. GameFlow is the classical theory for

game evaluation and designation. It is necessary to evaluate the excellent examples such as

Arknights with GameFlow. Actually, when distributing missions, Arknights reach the balance