ActRaiser

Professional mode: 
Complete the game, then press Up or Down(2) at the title screen. An 
option for professional mode will appear below the "New Game" 
selection. In this mode, your character has no magic and regular 
monsters are twice as hard to kill. 

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Extra lives: 
Extra lives may be obtained by: 
Creating a rainstorm over the lake east of Bloodpool. 
Discover that the pyramid causes an earthquake in Kasandora. 
Strike the Northwood temple with lightning.