=>Kill Boss: In the single player mode, there is an incredibly easy way to
kill off the bosses - simply call in a computer assistant, then hide while
the computer attacks. When the computer player leaves, call it back again.
Repeat until the boss is dead, and you'll never get hurt.
=>30 Lives: When the Contra Force title screen is scrolling down after you
turn the NES on, press U U D D L R L R A B SELECT START. If you want to
play a two player game with 30 lives, press SELECTx2 instead.
=>Continue: On the Game Over screen, hold A+B+SELECT and press START.