Mega Buster boost
Intentionally lose all lives three times on the same level. Dr. Light will appear and boost the Mega Buster.

Get Beat
Collect the letters B, E, A, and T.

Go to Dr. Wiley after the second set of four robots
Collect the letters W, I, L, and Y.

Four weapons
Enter the following password, where r = Rush, b = Beat, and f = Fliptop.

EBEE|r
BRRR E|E
EB E |b
EBERB|

After Dr. Wiley's tank
Enter the following password, where r = Rush, b = Beat, and f = Fliptop.

RREBB|r
RR BR|f
EBBREE|B
RE R B|

Near end
Enter the following password, where r = Rush, b = Beat, and f = Fliptop.

BBEBR |R|
R RE|f|
BEB EB|b|
BBBBR| |

Dr. Wiley
Enter the following password, where r = Rush, b = Beat, and f = Fliptop.

EREEE |b|
BRE BE|f|
EER R |B|
BRBEB | |