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According to designer Norio Okubo, Wario Blast was originally going to feature Mario instead of Wario - this was changed due to cultural sensitivity regarding bombs in certain regions, where it was decided that having a villain like Wario plant bombs would be seen as more appropriate than if a hero like Mario were to do so.
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Game password list:
https://themushroomkingdom.net/wb_passwords.shtml
Wario Blast Featuring Bomberman manual (Page 8):
https://www.retrogames.cz/manualy/GameBoy/Wario_Blast_Featuring_Bomberman_-_GameBoy_-_Manual.pdf
https://themushroomkingdom.net/wb_passwords.shtml
Wario Blast Featuring Bomberman manual (Page 8):
https://www.retrogames.cz/manualy/GameBoy/Wario_Blast_Featuring_Bomberman_-_GameBoy_-_Manual.pdf
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Its sequel, "Bomberman GB 2", was released in the west unaltered, however it was renamed simply "Bomberman GB".
Official Nintendo Magazine article:
http://www.officialnintendomagazine.co.uk/51480/features/12-amazing-wario-facts-and-secrets/?page=5
IGN page:
http://ign.com/games/bomberman-gb-japan/gb-9831
http://www.officialnintendomagazine.co.uk/51480/features/12-amazing-wario-facts-and-secrets/?page=5
IGN page:
http://ign.com/games/bomberman-gb-japan/gb-9831
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