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The Middle Three
People → Japan → Kai Harada (原田櫂)

People · Japan

Kai Harada (原田櫂)

3×3 · top 3.2% of 284,439 all-time · competing since December 2021 · 2021HARA01

Kai Harada (原田櫂) has been competing for 5 years. His best event is the 3×3: a personal-best single of 8.25, set at Tokyo Spring AM 2025, puts him in the top 3.2% of the 284,439 people who have ever been ranked in the event, and 137th in Japan. Until July 2008, no official 3×3 solve in the world had been that fast. Across 20 competitions since December 2021, he has put 154 official solves on the record across three events. Solve to solve, his 3×3 times vary about 14% around a typical one; 65% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 17.81 in December 2021 to 8.25, a 54% improvement. Kai has entered 20 competitions, more competitions than 97% of everyone who has ever competed.

3×3
best event — top 3.2% of 284,439 all-time
8.25
signature single · Tokyo Spring AM 2025
154
official solves on the record
14%
solve-to-solve spread · wider than 65% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingJapan
3×38.2510.17
top 3.2%137 / 3,329
2×23.815.32
top 24.1%304 / 1,021
5×51:32.721:42.82
top 29.6%178 / 420

Percentile against all competitors ever ranked in each event, a fairer measure than raw rank, because the pools differ by a factor of ten.

The line so far

Florida Fall 2021: 17.81Florida Spring A 2022: 15.70Ota Summer 2022: 12.90Tokyo Challenge Winter B 2023: 12.70Tokyo Challenge IV 2023: 10.79Rubik's WCA World Championship 2023: 8.51Tokyo Challenge VIII 2023: 11.88Tokai Open PM 2024: 10.20Shonan PM 2024: 10.29Singapore Championship 2025: 10.88Tokyo Open AM Winter 2025: 11.24Tokyo Spring AM 2025: 8.25Kanto Spring 2025: 9.81Kanto Summer AM 2025: 9.44Kanto Autumn AM 2025: 10.95Ota Autumn 2025: 8.73Ota Winter 2026: 10.10Kanto Spring 2026: 8.59Japan Championship 2026: 8.63Kanto Summer 2026: 9.148.2517.8111 Dec 202129 Aug 2026

Best single per competition, 3×3. Faster is higher — the axis is the right way up.

The story so far

Competitions

Reading this page: a single is one solve's time · an average is the middle three of five solves, best and worst discarded · a PB is a personal best · a DNF (did not finish) is an attempt with no valid result: a popped piece, an unsolved face, an over-limit memorisation · top X% compares against everyone ever ranked in that event, which is fairer than raw rank because event pools differ tenfold.

The circuit

The people whose scorecards keep turning up next to his.

Next targets

  • A sub-8 3×3 single — 7,931 people have one; it is 0.25 away.
  • A sub-3 2×2 single — 26,570 people have one; it is 0.81 away.

Targets move as he improves.