The 1999 Japanese release of Giga Wing is the original version of the game by Psikyo. This version likely serves as the foundation for all other regional releases, showcasing the core gameplay and design choices that defined Giga Wing's unique style.   This release from Psikyo is considered the most authentic and serves as the basis for all other versions.  It is highly likely that other regional releases were based on this version.

Giga Wing (990223 Japan)

Giga Wing (990222 USA Phoenix Edition)