Dynablaster

Typing HUDSONSOFT during the titlescreen gives
you unlimited lives, more bombs, greater range,
and enables:

[1] thru [8] : Select your level
[F1] thru [F8] : Select your episode

We also have some level codes :
EXOWMNVV MUKWONCE UKBLWWVG MWVWBTYV MAVWHBTP
MKAAOEZS UWNKVJLT MXKCMWVV MCZNSQZP MWECSQTS
UOZHNSTA MKLNPSPS UAWVOTGA MOLATJHR MWNEIOAA
UAOFQHAE UOZONPHE MAOEIEVC MCKAGELN UXVMFWEPH (Information from Cheat Machine)