More Continues And A Harder Game
For an increased challenge and 99 continues, go to the Options screen. Select 8 on Sound Test. When the music stops you will automatically play on "Yeah, Right" level with 99 continues. Or go to the Options screen, set the difficulty to "Hard" and wait. After a while, "Hard" will change to "Yea, Right" and the game will begin in Expert mode. You will have 99 continues.
Test Mode
Enter the code while the game is paused. This code only works with the Japanese version of the game. The code is C, up, down, B, right, right, C, A, up, left, down, B, A, B, left, Start.