《魂斗羅》（Contra /Operation C）是一款由科拿米於1991年1月8日製作和發行的Game Boy單人射擊遊戲，擁有1M的記憶體。

故事背景設定在《魂斗羅》（Contra）後，主角比爾（Bill Rizer）受命前往南太平洋的一個秘密島國，摧毀黑毒蛇集團在那裡進行的外星異形細胞實驗室，以防止外星人對地球的完全控制。

全部共有5個關卡，包括軍港、森林、洞穴以及實驗室等地，每次擊敗頭目即可前進到下一個舞台。架構以紅白機(Famicom)的《魂斗羅》及《超級魂斗羅》為主體設計。

畫面採用橫向移動和俯視角度兩種玩法，其中的第1、3、5關卡採用橫向移動前進，第2關及第4關則是採俯視角度。原本的雷射和機槍強化功能已被移除，剩下火焰槍和散佈槍，有加入全新的追蹤彈武器，發射後會自動鎖定敵人並進行攻擊。

遊戲中初始擁有三條生命，按下A鍵可進行跳躍，按下B鍵可進行射擊，若持續按B鍵可連續發射。相較於紅白機版本，GB的節奏更加流暢，跳躍力和移動速度也有所提升。子彈能夠更流暢地射向各個方向。

在日本版中，可以自由選擇前4個關卡開始遊戲，而在海外版則需要輸入科拿米密技才能選擇關卡。遊戲開始時，擁有3條生命。按下A鍵可讓角色跳躍，按下B鍵可進行射擊，並且持續按B鍵則可連續發射。如果玩家不想使用某種武器，只需等待一段時間，該武器就會自動消失。由於關卡中沒有時間限制，可以在特定位置通過獵殺敵人來增加生命數。然而，如果角色死亡，之前獲得的武器將會自動歸零。

在遊戲的標題畫面出現後，等待動畫結束，接著按上4次、下4次、左4次，最後按開始鍵，這樣就可以獲得額外的九條生命。這個密技僅限於海外版。

同樣在遊戲的標題畫面出現後，等待動畫結束，然後按上、下、左、右、開始鍵，這樣就可以進行聲音測試。在日本版中，此操作還會額外增加一條生命。

最後，在遊戲的標題畫面出現後，等待動畫結束，接著按上、上、下、下、左、右、左、右、B、A、B、A 和開始鍵，這樣就可以進行關卡選擇。在日本版中，這個操作將會增加九條額外的生命。

"Contra" (魂斗羅/ Operation C) is a single-player shooting game developed and released by Konami on January 8, 1991, for Game Boy, with a memory of 1M.

Set after the events of the original "Contra," the protagonist, Bill Rizer, is tasked with destroying an alien experimental laboratory operated by the Black Viper group on a secret island in the South Pacific. This is to prevent the complete takeover of Earth by the aliens.

There are a total of 5 stages, including military ports, forests, caves, and laboratories, with each boss defeat leading to the next stage. The game is designed based on the Famicom versions of "Contra" and "Super Contra."

The gameplay features both side-scrolling and top-down perspectives, with stages 1, 3, and 5 using side-scrolling movement and stages 2 and 4 using a top-down perspective. The original laser and machine gun upgrade functions have been removed, leaving only the flame gun and spread gun, with the addition of a new tracking bullet weapon that automatically locks onto enemies upon firing.

At the beginning of the game, the player starts with three lives. Pressing the A button allows the character to jump, while pressing the B button enables shooting, and continuous pressing of the B button allows for continuous firing. Compared to the Famicom version, the Game Boy version features smoother pacing, improved jumping ability, and faster movement speed. Bullets can also smoothly shoot in various directions.

In the Japanese version, players can freely choose from the first four stages to start the game, while in the overseas version, they need to enter a Konami code to select stages.

During gameplay, players have three lives. Pressing the A button allows the character to jump, while pressing the B button enables shooting. If players don’t want to switch weapons, they can wait for a certain amount of time, and the dropped weapon item will automatically disappear.

Since there is no time limit in the stages, players can increase their lives by hunting down enemies at specific locations. However, if the character dies, the previously acquired weapon will reset automatically.

After the game's title screen appears, wait for the animation to end, then press up four times, down four times, left four times, and finally press the Start button to gain an additional nine lives. This cheat code is only available in the overseas version.

Similarly, after the game's title screen appears, wait for the animation to end, and then press up, down, left, right, and the Start button to conduct a sound test. In the Japanese version, this operation will also grant an extra life.

Finally, after the game's title screen appears, wait for the animation to end, then press up, up, down, down, left, right, left, right, B, A, B, A, and the Start button to select stages. In the Japanese version, this operation will add nine extra lives.