Retrogaming

What is hardcore mode? -
Hardcore mode is an additional feature to separate out the good gamers from the great gamers: Hardcore mode disables all savestate ability in the emulator: you would not be able to save and reload at any time. You would have to complete the game and get the achievements first time, just like it were on the original console. In reward for this, you will earn both the standard and the hardcore achievement, in effect earning double points! A regular game worth 400 points, is now worth 800 if you complete it fully on hardcore! For example: if you complete the game fully for 400 points, you then have the opportunity to earn another 400 on hardcore.

If you want to play with the hardcore mode disabled (also known as "softcore"), expect to have some issues. More details here: Issues when NOT playing in hardcore mode