Activating both flashlight + hidden mod in any mode will make the song speed up or slow down around 1% (or even down to 0.1% if that's too much).
This should be easy to implement because it's like a invisible doubletime mod, it should make dual screening very hard because there will be an extra second (or a few milliseconds) to account for by the end of a 1 minute song.
It won't affect normal flashlight + hidden players because they remember the beatmap based on the music and muscle memory. The BPM of a 300 BPM song will only fluctuate by 3 BPM and that's insignificant.
This should be easy to implement because it's like a invisible doubletime mod, it should make dual screening very hard because there will be an extra second (or a few milliseconds) to account for by the end of a 1 minute song.
It won't affect normal flashlight + hidden players because they remember the beatmap based on the music and muscle memory. The BPM of a 300 BPM song will only fluctuate by 3 BPM and that's insignificant.