Kaeru no Tame ni Kane wa Naru, known as "Frog Game," is a 1992 Japanese-exclusive Game Boy title developed by Intelligent Systems and published by Nintendo. Despite never receiving an official Western release, the game connects to Link's Awakening through shared characters and music. The seven-hour adventure features a light narrative with references to Nintendo's history, including a visit to "Nantendo Inc." and a "Mamicon" console.

The game employs a unique dual perspective approach, using top-down exploration and side-scrolling dungeons. Unlike traditional RPGs, combat resolves automatically with no tactical options beyond running or using items. The game's most distinctive design choice is its "illusion of control," where players experience carefully scripted progression paths that maintain specific difficulty curves regardless of player actions. This creates an interesting gameplay paradox where players feel agency while following predetermined paths.

For non-Japanese players experiencing Frog Game, a 2011 fan translation patch enables full dialogue comprehension. The process requires dumping the ROM from a physical cartridge (typically $10 on eBay) and applying the patch via tools like ROM Patcher JS before playing on emulators like Delta. Despite technical limitations and a simple story, Frog Game offers a unique "pocket-sized" adventure that demonstrates Nintendo's experimental approach to handheld gaming during the early 1990s.