People · Japan
Ryuma Koga (古賀瑠磨)
3×3 · top 12.0% of 288,433 all-time · competing since December 2025 · 2025KOGA03
Ryuma Koga (古賀瑠磨) has been competing for 10 months. His best event is the 3×3: a personal-best single of 11.43, set at Shimonoseki Summer 2026, puts him in the top 12.0% of the 288,433 people who have ever been ranked in the event, and 522nd in Japan. Across 2 competitions since December 2025, he has put 10 official solves on the record across one event. His 3×3 best has come down from 14.59 in December 2025 to 11.43, a 22% improvement. Ryuma has entered two competitions.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Japan | |
|---|---|---|---|---|---|
| 3×3 | 11.43 | 14.58 | top 12.0% | 522 / 3,360 |
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
- 28 Dec 2025First competition: Shimonoseki 2025. A 14.59 3×3 single to start from.
Competitions
- Shimonoseki Summer 2026 · 9 Aug 2026 — 1 personal best set
- Shimonoseki 2025 · 28 Dec 2025
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.
Next targets
- A sub-10 3×3 single — 21,606 people have one; it is 1.43 away.
Targets move as he improves.