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{{Collapsible|Key unlock| | {{Collapsible|Key unlock| | ||
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 | 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. This code snippet translated to "CHANGE SPEC TO FACTOR", suggesting that the word "'''''spec'''''ial" is to be replaced with "'''''factor'''''ial". | ||
The | The link [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 factorial, a 20-digit number. | ||
Enter 51090942171709440000 ( | Enter 51090942171709440000 (=21!) as a serial code on maimai DX NET. | ||
}} | }} | ||
{{Collapsible|Course song list| | {{Collapsible|Course song list| |
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