*Start button can now be used to confirm some options. *Got rid of the annoying “press start to exit” feature in some menus. *Maximum number of lives in options menu increased to 5 (default is still 3). *Copyright screen can now be skipped by pressing the start button. *A new code is available that takes you to the game’s debug level! Press Left, Right, Left, Right, A, B, C, B, A, Up, Down. *Player 1 and Player 2 can now select the same character. *Up to ten lives can be selected in the menu. (Note, however, that unlike the Japanese version, these codes are entered on controller ONE.) For unknown reasons, this functionality was removed when the game was released in the US and EU, making the game vastly more difficult in the process. *Restores the three hit-points present on the Japanese version. *Without region-lock, so it plays on a Mega Drive of any region. *'Contra: Hard Corps' version with the original characters, not the european 'Probotector' one.

Improved version of the excellent Contra Hard Corps:

Download contra hard corps mega drive