Start a new game and die on purpose to lose a life, remember the password you receive. Go to enter the password, but replace the first 2 letters with ''F E'' or ''E F'' and you're character will be much stronger.
Color and Monitor Adjustment
First connect the Family BASIC Keyboard on the Famicom's Expansion port. Now, on the title screen, hold A + B on controller 1 and C or M on the keyboard and Reset the game. Holding C will give you the Color Adjustment and M will give you the Monitor Adjustment.
Sound, CHR RAM, Timer, and CRC Tests
First connect the Family BASIC Keyboard on the Famicom's Expansion port. Now, on the title screen, hold A + B on controller 1 and a button on the keyboard and Reset the game. Hold "@" for a CHR RAM test, L for a CRC test, T to turn on the timer, or S for a sound test.
Best attack & defense items, 50 ludder, magic key, Rubas' lair unlocked, all 7 towers still accessible, enemies & shops at the beginning level, 86 max HP. EE1KBK.TTT
Extra Items FE1K10.TDK
Final Password EF1KDK.KTX
Max HP is 300 O51O1MYILJ
Ready to fight Rubas (w/ Double Shot) 54DK1P4WC4
Ready to fight Rubas (w/ Parallel Shot) AZODKNXTJ
Start off with 5 bells, Hyper boots, all defensive items, and all attack items. GDXHDPMM10
Start with Normal Sword and max HP of 300