On the title screen, type "HAMBURGER". The word {Cheat} will appear below the credits press your joystck button, then 'F5' when the jungle screen comes up. During play press any of the following keys:
'F1'-------------Starts you where you currently are
'F2'-----------Starts you at location of explosives
'F3'--Starts you at the bridges you need to blow up
'F4'------Starts you at the village (hidden tunnel)
(Cheat doesn't work any further than this)
If you type "-HILL" (where the hyphen is the minus on the keypad) after you have typed "HAMBURGER". When the credit screen re-appears the words {MEGA CHEAT} will appear when the credits scroll.
'F2'---------------Start a TNT | 'F4'------Start at the village
'F3'-------Start at the bridge | 'F5'--immunity from everything