Pocket no Naka no Oukoku (Kingdom in Your Pocket), a prototype Game Boy Color game from Japan, is notable for its unfinished status. As a prototype, the game is incomplete, possibly with missing features, bugs, or unfinished game mechanics. Due to its unfinished nature, it would not have the same level of polish or gameplay consistency as commercially released games.  The prototype status indicates an early stage of development, revealing the early conceptualization and game design process behind the final product which would help further understand game development in that period. Without full release, gameplay and other elements might not reflect the planned final product.

Pocket no Naka no Oukoku (Japan) (Proto)

Pocket Monsters Kin (Japan)