(This is actually an anti-piracy mechanism, confirmed by the author of the game: https://twitter.com/Inatsuka/status/1759713009751253186 )

There is a "hidden difficulty" in this game, when activated, every mode from Easy to Lunatic will have a significant change of difficulty: Bullet patterns will be denser, enemies including bosses will become more bulletproof, the 6th stage will be a bit longer before the final boss.

Also, there is a secret enemy type that will interfere in every stage when this mode is activated, it's the Croquette Fairy (コロッケ妖精), a mascot of the author of this game I think: https://twitter.com/korokke_fairies


In this mode, after beating a stage, there is a chance that you can play a "Matching Cards" game featuring all characters as card images.

You can't achieve any Ending as well as unlock any extra.

To unlock this mode, go to the game's directory and create a text file named "steam_appid.txt", put the game id 1388230 in that file then save.

Please note that this may be incompatible with your existing replays.