Alternative Sphere (Web Trial) Stage 3-A - Normal

[KiraXVII]

Can you tell me how to proceed to stage 2-B and 3-B?

I've beated stage 1 several times, but I was only dispatched to stage 2-A in every single attempt...

[GloriousLight]

That's odd. To access the B side of the stages you are prompted a question at the end of the stage, after dialogue ends and before the score resume. Picking the upper option takes you to the A side, the lower option takes you to the B side. Maybe it also has a score requirement or some other condition...