People · Singapore
Koo Jia Kai
2×2 · top 5.7% of 189,179 all-time · competing since October 2025 · 2025KAIK02
Koo Jia Kai has been competing for a year. His best event is the 2×2: a personal-best single of 2.13, set at Singapore Championship 2026, puts him in the top 5.7% of the 189,179 people who have ever been ranked in the event, and 96th in Singapore. Until February 2008, no official 2×2 solve in the world had been that fast. Across 6 competitions since October 2025, he has put 90 official solves on the record across five events. Solve to solve, his 3×3 times vary about 10% around a typical one, an early reading from 5 counted rounds. His 2×2 best has come down from 2.56 in October 2025 to 2.13, a 17% improvement. Koo has entered six competitions, more competitions than 86% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Singapore | |
|---|---|---|---|---|---|
| 2×2 | 2.13 | 3.11 | top 5.7% | 96 / 1,064 | |
| 3×3 | 10.25 | 11.67 | top 8.2% | 219 / 1,559 | |
| 4×4 | 37.76 | 45.04 | top 9.6% | 82 / 466 | |
| 3×3 one-handed | 18.14 | 22.21 | top 15.5% | 111 / 471 | |
| 5×5 | 1:50.22 | — | early days — 2 solves | 141 / 254 |
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, 2×2. Faster is higher — the axis is the right way up.
The story so far
- 18 Oct 2025First competition: Singapore Kempinski Open 2025. A 12.20 3×3 single to start from.
Competitions
- Singapore Aug Even 2026 · 2 Aug 2026 — 2 personal bests set
- NUS Mini 2026 · 21 Jun 2026 — 1 personal best set
- Singapore Double or Nothing Parity Mayhem 2026 · 24 May 2026
- Singapore Championship 2026 · 20 Feb 2026 — 1 personal best set
- Singapore Warm Up January 2026 · 3 Jan 2026 — 2 personal bests set
- Singapore Kempinski Open 2025 · 18 Oct 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.
The circuit
The people whose scorecards keep turning up next to his.
- Akash Sreedharan (ஆகாஷ் ஸ்ரீதரன்) — met in 17 rounds, finished ahead 3 times
- Ng Jia Quan (黄佳铨) — met in 16 rounds, finished ahead once
- Aiden Lim Tze Choon — met in 16 rounds, finished ahead once
Next targets
- A sub-2 2×2 single — 9,039 people have one; it is 0.13 away.
- A sub-10 3×3 single — 21,606 people have one; it is 0.25 away.
Targets move as he improves.