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(I'm Japanese, so I'm not good at using English.)

All stages are cleared.

But I can't play 2nd level area located below.

What should I do next? or this is a bug?

https://gyazo.com/7806bde02d11e90b800a35e16428164d

https://gyazo.com/b75b827ec0d39af65d2e5cec30297adb