This is a revision of Ultraman Club - Chikyuu Dakkan Sakusen. The 'Rev 1' designation signifies a later release version with potential bug fixes, minor gameplay tweaks, or other improvements implemented based on feedback or discovered issues in the initial release.  The core gameplay would remain similar to the original version of the game. The development and publishing remain the same as the original release. 

Ultraman Club - Chikyuu Dakkan Sakusen (Japan) (Rev 1)

Ultraman - Kaijuu Teikoku no Gyakushuu (Japan) (Disk Writer)