《彩虹島》（英文原名：Rainbow Islands: The Story of Bubble Bobble 2，日版原名：レインボーアイランド，街機版 MAME ROM 代號：rbisland）是日本知名遊戲廠商 Taito 於 1987 年在大型機台推出的經典平台跳躍遊戲，同時也是人氣名作《泡泡龍》（Bubble Bobble）的正統續篇。本作放棄了前作單一畫面的固定式過關玩法，改為垂直捲軸的攀爬機制，並以鮮豔明亮的色彩、可愛清新的童話風格，在當年的街機遊戲市場中掀起了一股溫馨且充滿挑戰的冒險風潮，隨後也被移植到多個家用主機平台。

在核心玩法與操控機制方面，本作展現了極高且極具創意的戰術深度。玩家所控制的主角不再吐出泡泡，而是改用「彩虹」作為唯一的武器與工具。彩虹不僅可以用來直接攻擊敵人或砸死下方的目標，更可以當作臨時的跳躍台階或攀爬梯子，讓玩家一步步往畫面頂端攀升。隨著關卡推進，玩家還能透過收集特定道具來讓彩虹具備加速、貫穿或雙倍攻擊等強化效果。遊戲設計了多個風格迥異的主題世界，從玩具島、糖果島到音樂島等應有盡有，每一個世界都在視覺上呈現出截然不同的童話風情，且隨著高度不斷攀升與關卡推進，敵人的配置與跳躍容錯率也變得越來越嚴苛。

本作最為玩家津津樂道且充滿魅力的特色，莫過於其深藏不露的隱藏要素與嚴格的通關條件。遊戲中共有多個各具特色的關卡世界，而要解鎖後半段的秘密關卡與真正結局，玩家必須在前面的特定世界中集齊象徵彩虹七色的七顆閃耀鑽石。這種需要精準路線規劃與道具收集的設計，大大提升了遊戲的耐玩度與探索樂趣。

總體而言，《彩虹島》不僅是一款老少咸宜、洋溢著童趣與歡樂的平台跳躍傑作，它更透過將攻擊與地形互動完美結合的彩虹機制，在 80 年代後期的街機黃金時代中樹立了難以替代的獨特地位。無論是流暢的攀爬節奏、豐富的隱藏要素，還是那段至今仍讓人回味無窮的輕快旋律，都讓它成為了無數復古遊戲愛好者心中永恆的經典回憶。

Rainbow Islands: The Story of Bubble Bobble 2 (Japanese: レインボーアイランド, Arcade MAME ROM set code: rbisland) is a classic platform-jumping game released by the renowned Japanese game developer Taito in 1987, serving as the official sequel to the hit classic Bubble Bobble. Eschewing the single-screen, fixed-arena gameplay of its predecessor, the game introduces a vertical-scrolling climbing mechanic. With its vibrant, bright colors and charming fairy-tale aesthetic, it created a heartwarming yet challenging adventure trend in the arcade market before being ported to numerous home console platforms.

In terms of core gameplay and control mechanics, the title showcases a remarkably high degree of creative tactical depth. The protagonist no longer blows bubbles, relying instead on "rainbows" as their sole weapon and versatile tool. Rainbows can be used to directly attack enemies or crush targets positioned beneath them, as well as serve as temporary platforms or ladders allowing players to step-by-step ascend to the top of the screen. As the stages progress, players can collect specific power-up items to grant their rainbows enhanced properties such as increased speed, piercing capabilities, or dual-strike effects. The game features a series of distinct themed worlds—ranging from Toy Island and Candy Island to Music Island—each presenting a completely different fairy-tale visual flair. As the vertical climb continues and stages advance, enemy placements and jumping error tolerances become increasingly strict.

The most celebrated and compelling feature of the game is its well-hidden secrets and rigorous completion requirements. Across multiple distinct worlds, unlocking the later secret stages and the true ending demands that players meticulously collect all seven shimmering diamonds representing the colors of the rainbow. This design, which heavily rewards precise route planning and item collection, vastly increases replay value and exploratory joy.

Overall, Rainbow Islands is not only a family-friendly platforming masterpiece overflowing with childlike innocence and joy, but it also secured an irreplaceable and unique status in the golden age of late-1980s arcades by perfectly integrating combat and terrain interaction through its iconic rainbow mechanic. Whether through its smooth climbing pacing, rich hidden elements, or the catchy, upbeat melody that remains unforgettable to this day, it stands as an eternal classic in the hearts of retro gaming enthusiasts.