Time attack mode
     Complete  the  game  with  the  first ending. At the stage select
screen press SQUARE to play Time Attack.

Hidden movie
     Complete  the  game  with  the  second  ending and collect all 99
archive  items to unlock the 100th item. Go to the stage select screen
and  move the cursor to the upper right corner. There is a cinema that
takes place in 684 AD showing the fate of the alien visitor.

Brain Cell Revival Game
     Find Archive item #087 Kyoya Sudo's stage, Day 3, 03:00. The game
becomes available from the main menu.