Even with it's hard difficulty, the boss is still relatively easy than I thought. By the way, the extreme difficulty is now unlocked as I completed all easy/normal/hard difficulties, so it's not over yet! But I did try to improve some minigame scores, some of them are hard to control... had to skip Pong due to missing graphics.
Playlist of the playthrough: • RPG Maker 2000 - Pac-M...