In this game there is a hidden ending. Nobody knows how to get it, but the game has a hidden text. Game END for the "dark side".
Note: nigori or panigori symbols need to be entered separately from main kana symbol, like for ゴ you should enter コ and then ". So Each password contains 16 symbols in total. キングゴジュラスカイタイナ - Secret map パスワドニハギルベイダ - Secret map
I have broken the rules. I posted a link to hacked Rom. So has deleted the message.
1. Download: http://www.romhacking.net/utilities/581/ 2. Searching options: Separate byte: 01 3. Change options: Separate byte: 00 4. Address (10 Dec) 16 - 100 5. Button "Rechange file" 6. Button "Execute file" (before this select emulator - button "Emulator") 7. Execute file. If Mario small - go to  and change address 100-200. Step: 100, push button "> plus". And so until will find the Big Mario. (address hex 1072)
1. fix searching for of importances, beginning with zero (program was terminated with error!) 2. added menu: search -> set interval 3. find with table -> added searching with interval 4. relative search -> added searching with interval 5. relative scan -> added searching with interval