[Up:W Down:S Left:A Right:D | Fire:J Jump:K] or using a joystick in the download edition. You can redefine them in the options.
(1)GOD MODE: press "Shift+2+P" during playing: no one can beat you.
(2)Press "Shift+2+S", while press "OK" button in the game options, you get SPREAD GUN as default weapon, and "Shift+2+L" for laser gun, etc.
Tips: Harder difficulty (in the game options) result in higher score!
(Cheat code may get your hiscore halved or rejected)
Contra(or Probotector) is originally an arcade game released in 1987 by the Konami corporation. This anniversary edition features more options and better effects with an advanced hiscore system.