Puzzle Game
Acquire archive 087 on Kyoya Sudo's stage, Day 3, 03:00 

Time Attack Mode
Complete every scenario and objectives one and two for all stages 

Archives Trick 
After you finished the game and unlocked the zuno game, go to the stage where 
your archive is missing, take it, then in the menu select Back To Title.Then, enter 
the zuno game and immediately exit. The game should ask you to save on your 
game file. Save and the archive will be saved also. 

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

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.