The is the original American release of the 2004 Game Boy Advance remakes of the classic Gen 1 games. While a later version (v1.1) exists, v1.0 remains the gold standard for the ROM hacking and speedrunning communities due to its consistent internal structure and "glitch-friendly" nature. Key Technical Differences: v1.0 vs. v1.1

: Most speedrunning leaderboards and world records are established using the v1.0 base to ensure parity across attempts.

: The word "PRESENTS" is famously missing from the Game Freak logo screen in v1.0, even though the graphics for it are hidden in the ROM data.

: v1.0 retains a famous oversight on Nugget Bridge in Cerulean City where players can repeatedly lose to a Team Rocket Grunt to farm infinite Nuggets .

While both versions offer the core Kanto experience, v1.0 contains several unique bugs and presentation quirks that were "fixed" in the v1.1 revision.

: In v1.0, the Pokédex displays only the first word of a Pokémon's category. For example, Pidgey is listed as the "Tiny" Pokémon instead of the correct "Tiny Bird" Pokémon.