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{{Collapsible|Key unlock| | {{Collapsible|Key unlock| | ||
Enter 51090942171709440000 (equal to 21 factorial) as a serial code on maimai DX NET. | Enter 51090942171709440000 (equal to 21 factorial) as a serial code on maimai DX NET. | ||
Upon the release of BLACK ROSEちほー10, the instrumentals section of [https://maimai.sega.jp/kotonoha/special/ maimai.sega.jp/kotonoha/special/] was updated to include an audio file consisting of a telegraph key transmitting Morse code, which translated to "CHANGE SPEC TO FACTOR". | |||
The domain [https://maimai.sega.jp/kotonoha/factorial/ maimai.sega.jp/kotonoha/factorial/] displayed a short message, as well as a graphic containing a card with the Roman numeral XXI (21), thus giving the final solution of 21!, a 20-digit number. | |||
}} | }} | ||
{{Collapsible|Course song list| | {{Collapsible|Course song list| |
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