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People · United States

Kevin Costello III

3×3 · top 0.35% of 284,439 all-time · competing since January 2012 · 2012COST01

Kevin Costello III has been competing for 15 years. His best event is the 3×3: a personal-best single of 5.74, set at Melrose Spring 2015, puts him in the top 0.35% of the 284,439 people who have ever been ranked in the event, and 230th in the United States. Until June 2011, no official 3×3 solve in the world had been that fast. Across 65 competitions since January 2012, he has put 3,132 official solves on the record across 15 events. Solve to solve, his 3×3 times vary about 13% around a typical one, steadier than 61% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 17.81 in January 2012 to 5.74, a 68% improvement. Kevin has entered 65 competitions, more competitions than 99% of everyone who has ever competed.

3×3
best event — top 0.35% of 284,439 all-time
5.74
signature single · Melrose Spring 2015
3,132
official solves on the record
13%
solve-to-solve spread · steadier than 61% of the field

Standing, event by event

vs everyone ever ranked
EventPB singlePB averageAll-time standingUnited States
3×35.747.30
top 0.35%230 / 59,724
4×424.5927.53
top 0.6%105 / 19,072
2×21.302.58
top 1.4%566 / 40,951
3×3 one-handed10.6613.45
top 1.5%244 / 15,683
5×549.8457.17
top 1.7%144 / 9,401
Pyraminx3.365.71
top 4.9%1,287 / 28,708
Megaminx49.5858.56
top 4.9%349 / 7,841
6×61:49.101:52.52
top 6.8%235 / 4,196
7×72:47.642:54.94
top 7.2%195 / 3,184
Skewb4.195.78
top 12.2%1,904 / 18,907
3×3 Fewest Moves32 moves36.33
top 20.4%446 / 2,040
Clock10.6213.57
top 28.2%2,173 / 8,927
3×3 blindfolded2:13.43—
top 37.7%795 / 2,092
Square-124.9131.55
top 39.0%2,534 / 6,743
3×3 Multi-Blind1 of 2 cubes · 9:55—
early days — 1 solve684 / 731

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

Berkeley Winter 2012: 17.81Harvard Spring 2012: 13.47Cal Day 2012: 12.63Yale Spring 2012: 10.34Brown Cubing Day 2012: 11.97River Hill Summer 2012: 9.16St. Joseph's College Summer 2012: 9.84Yale Fall 2012: 10.50Princeton Fall 2012: 9.30Harvard Fall 2012: 9.84Chesapeake Science Point Fall 2012: 9.72MIT Fall 2012: 8.97Levittown Open 2012: 7.40River Hill Winter 2013: 8.89MIT Spring 2013: 8.59Cornell Open Spring 2013: 9.55Chesapeake Science Point Spring 2013: 8.50Berkeley Spring 2013: 9.28Newark Head to Head 2013: 9.74World Rubik's Cube Championship 2013: 7.38Berkeley Summer 2013: 6.94CCFC Fall 2013: 8.43Harvard Fall 2013: 7.91Slow 'n Steady Fall 2013: 7.43Starlight Open 2013: 7.97Lexington Fall 2013: 8.18CCFC Winter 2014: 7.80River Hill Winter 2014: 7.59Princeton Winter 2014: 7.36Williams Winter 2014: 7.22Yale Spring 2014: 7.90Lexington Spring 2014: 6.78Cornell Open Spring 2014: 6.44CCFC BLD Day 2014: 7.92US Nationals 2014: 6.55Starlight Open 2014: 7.24River Hill Summer 2014: 6.95GCC Fall 2014: 6.88Harvard Fall 2014: 7.16Lexington Fall 2014: 6.87MIT Fall 2014: 7.68Williams Winter 2015: 6.62Lexington Spring 2015: 5.99Melrose Spring 2015: 5.74US Nationals 2015: 6.95Lexington Fall 2015: 7.57Northeastern Fall 2015: 7.19Melrose Winter 2016: 7.85Lexington Summer 2016: 5.75US Nationals 2016: 6.91Quabbin Open 2016: 5.98Princeton Fall 2016: 5.97Monument Mountain Winter 2017: 7.00WPI Winter Cube Day 2017: 7.35Framingham Frozen Fingers 2018: 7.16MIT Fall 2018: 7.80Leeds Open 2019: 6.64Empire State Fall 2019: 7.19MIT Winter 2020: 7.66CubingUSA Northeast Championship 2022: 7.39Niskayuna Nimble Fingers 2023: 7.12PBs in Palisades 2023: 6.07CubingUSA Nationals 2023: 5.89Rubik's WCA World Championship 2025: 7.975.7417.8128 Jan 20123 Jul 2025

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-5 3×3 single — 344 people have one; it is 0.74 away.
  • A sub-20 4×4 single — 42 people have one; it is 4.59 away.

Targets move as he improves.