Easy,Normal,hard

Hi,dudes how can I make level dificult?You,know you choose to play the
level on easy,hard or normal mode?

level on easy,hard or normal mode?












Difficulty = 2;
// On enemy Create Actor event
health = Difficulty * 25;
// On player collision with enemy
Player.health = Player.health - (5 * Difficulty);
// Somewhere ;)
int i;
for (i = 0; i < Difficulty; i++) CreateActor("Enemy", ....);
....