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When you have beaten the game 'Stage Select' mode will become an available option at the 'Main' menu. The only stages that will be availalbe for selection though will be those that you have already completed.
When you have completed ALL the stages in Arcade mode this feature will become an available option. In Endless mode stages are played successively without boss battles.
This feature becomes unlocked when you have completed the first stage. Stage mode lets you replay already played stages.
When you have completed Arcade mode on any difficulty setting and viewed the credits 'Extra' mode will become an available option. To select 'Extra' mode start a new game and choose Arcade and you will be given the choice of playing 'Normal' or 'Extra' mode.