People · Japan
Kota Aruga (有賀晃太)
3×3 · top 4.1% of 284,439 all-time · competing since November 2023 · 2023ARUG01
Kota Aruga (有賀晃太) has been competing for 3 years. His best event is the 3×3: a personal-best single of 8.67, set at Ota Autumn 2025, puts him in the top 4.1% of the 284,439 people who have ever been ranked in the event, and 174th in Japan. Until July 2008, no official 3×3 solve in the world had been that fast. Across 11 competitions since November 2023, he has put 134 official solves on the record across ten events. Solve to solve, his 3×3 times vary about 13% around a typical one, steadier than 59% of the 35,811 competitors with ten or more counted rounds. That figure sets aside his 3 DNFs. His 3×3 best has come down from 22.63 in November 2023 to 8.67, a 62% improvement. Kota has entered eleven competitions, more competitions than 93% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Japan | |
|---|---|---|---|---|---|
| 3×3 | 8.67 | 10.21 | top 4.1% | 174 / 3,329 | |
| Megaminx | 51.68 | 57.43 | top 5.8% | 41 / 313 | |
| 3×3 one-handed | 16.76 | 19.79 | top 12.0% | 110 / 529 | |
| Pyraminx | 5.46 | 7.83 | top 16.2% | 188 / 688 | |
| 2×2 | 3.60 | 5.61 | top 21.4% | 265 / 1,021 | |
| Clock | 13.51 | 19.12 | top 41.8% | 151 / 263 | |
| Square-1 | 29.31 | 35.73 | top 48.1% | 150 / 245 | |
| 4×4 | 1:19.19 | 1:50.89 | top 55.2% | 489 / 667 | |
| 3×3 Fewest Moves | 45 moves | 50.00 | top 65.6% | 155 / 201 | |
| 5×5 | 2:41.14 | 2:45.69 | top 70.9% | 348 / 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
Best single per competition, 3×3. Faster is higher — the axis is the right way up.
The story so far
- 11 Oct 2025First sub-10 3×3: 8.91 at Kanto Autumn PM 2025.
- 20 Apr 2025First sub-20 3×3: 11.62 at Tokyo Spring PM 2025.
- 20 Apr 2025First sub-15 3×3: 11.62 at Tokyo Spring PM 2025.
- 4 Nov 2023First competition: Tokyo Challenge VIII 2023. A 22.63 3×3 single to start from.
Competitions
- Kanto Summer 2026 · 29 Aug 2026
- Kanto Spring 2026 · 17 May 2026 — 2 personal bests set
- Tokyo FMC Spring 2026 · 12 Apr 2026
- Ota Winter 2026 · 25 Jan 2026 — 1 personal best set
- Ota Autumn 2025 · 8 Nov 2025 — 1 personal best set
- Kanto Autumn PM 2025 · 11 Oct 2025 — 1 personal best set
- Kanto Summer AM 2025 · 30 Aug 2025 — 1 personal best set
- Tokyo Summer 2025 · 21 Jul 2025 — 2 personal bests set
- Kanto Spring 2025 · 31 May 2025
- Tokyo Spring PM 2025 · 20 Apr 2025 — 1 personal best set
- Tokyo Challenge VIII 2023 · 4 Nov 2023
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.
- Hajime Miyazaki (宮崎朔) — met in 27 rounds, never finished ahead
- Takumi Kawazoe (川添匠) — met in 25 rounds, never finished ahead
- Zirui Wang (王子睿) — met in 24 rounds, finished ahead 11 times
Next targets
- A sub-8 3×3 single — 7,931 people have one; it is 0.67 away.
- A sub-50 Megaminx single — 1,776 people have one; it is 1.68 away.
Targets move as he improves.