Hachiju-hachiya | 8B+ Boulder problem at Mizugaki

Japan / Yamanashi

Slab. Also known as 八十八夜.

Another contender for world’s hardest slab. Originally graded 四段 V12; upgraded to 五段 V14 (by the first ascentionist) in the 2024 guide, having had no repeats in ~20 years.

Contributors
TdG
34 contributions since 19th July 2025.
2 contributions since 20th July 2025.

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Pics + Vids

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Ascents

1 successful ascent recorded.

Climber Style Ascent Date Suggested Grade
Tokio Muroi Boulder | worked 1st November 2003-30th November 2005 8A+
First ascent.