《天蠶變》（ギャルズパニック/Gals Panic）是由日本金子製作所(Kaneko)公司於1990年製作，由太東發行的街機遊戲，最多可以兩人同時挑戰。屬於經典的「畫圖占領」類型，玩法與早期的《Qix》非常類似，但其特殊之處在於結合成人題材。受眾群體主要是成年玩家，並且在當時的街機市場中具有一定的爭議性和吸引力。發行的續作直到第4代，番外篇S系列則有3款。

不以劇情為主軸，目標是透過控制角色切割畫面，逐漸揭示隱藏在畫面背後的女性圖像。在遊戲的設定中，玩家進入一個虛擬世界，通過切割屏幕來解鎖畫面。每個關卡都有一個女性角色作為背景圖，當切割完成一定比例的畫面時，背景中的圖像會逐步顯現。首先從6位女性中選擇最喜歡的人物，敵人會依照玩家取得的領地來改變大小。每關由3個循環組成，共有18個舞台。獨特之處在於，隨著遊戲的進展，所解鎖的女性圖像會越來越露骨。然而，這些圖像在當年引發不少爭議，因為它們挑戰當時的倫理和道德標準。

控制的角色可以在畫面邊緣移動，當按下行動鍵時，角色會離開邊界進行切割。需要在畫面上劃定區域，並盡可能占領更多的空間，以逐步揭示背景圖像。然而，畫面中有各種敵人和障礙物，如果在劃線時被敵人碰到，將會失去一條生命。遊戲的難點在於如何避免敵人的攻擊，同時盡快完成畫面的切割。隨著關卡進行，敵人的數量和速度也會增加，挑戰難度更高。每個關卡都有時間限制，需要在時間內完成足夠的區域占領才能過關。有各種道具，可以幫助加快進程或獲得額外的保護，比如暫時凍結敵人的時鐘或增加生命值。其他道具有飛碟(會掉下許多流星，敵人碰到就會被消滅)、加4分的漢堡。全破第一輪及第二輪的時候會有迷你遊戲，道具有加減時間、回到上個關卡的倒退、可以進行短暫休息的動畫。

《天蠶變》有許多優點，其中之一是其創新性和刺激性。雖然本質上是《Qix》的變體，但通過成人題材的加入，成功吸引大批成年玩家。畫圖占領類型的遊戲本身具有很強的策略性和挑戰性，需要平衡風險與收益，在敵人來臨前迅速完成畫面切割。這種緊張感和成就感使得遊戲在街機廳中非常受歡迎。此外，圖像設計和美術風格也受到好評，尤其是隨著關卡推進，背景女性圖像的變化帶來更多的期待感和動力。對於很多玩家來說，解鎖這些隱藏圖像是遊戲的一大樂趣。然而，主要的缺點是成人內容引發不少道德爭議，並不是每個街機廳都願意引進。此外，關卡重複性較強，雖然每個關卡的難度和背景圖像有所不同，但核心玩法相對單一，容易讓感到乏味。敵人的行動模式也較為固定，這使得某些玩家在經過多次遊玩後可能會感到缺乏新鮮感。

總體來說，作為一款結合成人題材的街機遊戲，在當時具有相當的影響力和吸引力。它既創新又充滿挑戰性，為玩家帶來不一樣的街機遊戲體驗。儘管存在一些爭議和局限性，但仍然在街機遊戲歷史上佔有一席之地。

Gals Panic (ギャルズパニック), known as Tianshenbian in Chinese, is an arcade game developed by Kaneko in 1990 and distributed by Taito. It allows up to two players to play simultaneously. The game falls under the classic "territory capture" genre, with gameplay similar to the earlier game Qix, but its uniqueness lies in the incorporation of adult content. Its target audience was primarily adult players, and the game attracted both controversy and attention in the arcade market of the time. The series continued with sequels up to the fourth generation, and there were three spin-off titles in the "S" series.

The game does not focus heavily on a storyline. The objective is for players to control a character and cut away portions of the screen to gradually reveal hidden images of women behind the gameplay area. In the game's setup, the player enters a virtual world and slices through the screen to unlock the image. Each stage features a female character as the background image, and as the player claims more territory by cutting the screen, the background image gradually becomes visible.

Players begin by selecting one of six female characters, and the size of enemies changes based on how much territory the player has acquired. Each level consists of three cycles, with a total of 18 stages. The distinct feature of the game is that as the player progresses, the revealed images of women become increasingly provocative, which caused significant controversy at the time for challenging ethical and moral standards.

In terms of controls, the player’s character can move along the edges of the screen. When the action button is pressed, the character leaves the boundary to start slicing into the screen. The goal is to section off and occupy as much territory as possible to reveal the background image while avoiding enemies and obstacles on the screen. If the character is hit by an enemy while drawing a line, the player loses a life. The difficulty lies in avoiding enemy attacks while quickly capturing areas of the screen. As the player advances, the number and speed of enemies increase, raising the level of challenge.

Each level is timed, and the player must capture a sufficient amount of territory within the time limit to progress to the next stage. Various power-ups are available to speed up the process or provide additional protection, such as a clock that temporarily freezes enemies or items that grant extra lives. Other power-ups include flying saucers that drop meteor showers to eliminate enemies and burgers that add four points to the score. Upon completing the first and second rounds, players are rewarded with mini-games and animations that allow them to rest briefly, with power-ups including time extensions or the ability to replay previous levels.

One of the key strengths of Gals Panic is its innovation and excitement. While it is essentially a variation of Qix, the incorporation of adult themes successfully drew in a large audience of adult players. The territory capture genre itself is highly strategic and challenging, requiring players to balance risk and reward by completing screen captures before enemies arrive. This tension and sense of accomplishment made the game extremely popular in arcades. Additionally, the artwork and graphic design were praised, particularly for how the changing background images of women added anticipation and motivation as players progressed. For many, unlocking these hidden images was a central pleasure of the game.

However, the game's major drawback was the controversy surrounding its adult content, which led to moral objections and made some arcades reluctant to feature it. The repetitive nature of the levels was also a downside; although each level presented different challenges and background images, the core gameplay remained relatively unchanged, which could lead to boredom. The enemy movement patterns were also somewhat predictable, causing some players to lose interest after repeated playthroughs.

Overall, Gals Panic was a groundbreaking arcade game that blended adult themes with a classic gameplay genre, making it highly influential and appealing at the time. It offered an innovative and challenging experience for players, providing a unique take on arcade gaming. Despite the controversies and limitations, it remains a notable title in arcade game history.