Cube Timer and Scrambler
WCA-style scrambles for 2×2 to 5×5, Pyraminx, Skewb and Megaminx with a space-bar timer that keeps ao5, ao12 and ao100
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A speedcubing timer with WCA-notation scrambles for 2×2 to 5×5, Pyraminx, Skewb and Megaminx, timing by space bar or by holding the screen, with ao5, ao12 and ao100 per puzzle.
How to use
- Pick a puzzle; a scramble appears at once. For cubes, check your cube against the net under "Scramble picture" (white on top, green in front). "Next scramble" makes a new one.
- Hold the space bar or the timer until it turns green (0.3 s), release to start, and press any key or the timer to stop. With "15 s inspection" on, the first press starts the inspection countdown.
- Mark the last solve "+2" or "DNF", or remove it with "Delete last solve"; the statistics and the trend chart update at once.
- "Save as CSV" exports the session; "Clear session" deletes the current puzzle's solves only.
How it works
- ao5 is the mean of the last five solves without the fastest and the slowest, as in WCA competitions. One DNF counts as the slowest; two make it DNF. ao12 and ao100 (not WCA formats) drop one best and one worst too.
- 2×2 and 3×3 scrambles are random-state: a random position is solved (two-phase Kociemba solver, or an optimal 2×2 solver) and the solution is written backwards. The other puzzles use random moves that never turn one face twice in a row or one axis three times in a row.
- As in the WCA inspection rule, over 15 s adds +2 and over 17 s gives DNF. Solves are saved per puzzle in this browser only.
Questions and answers
- What does ao5 mean in cubing?
- Average of 5. For 12.10, 10.50, 11.30, 15.80 and 9.90, drop 9.90 and 15.80; the mean of the other three, 11.30, is the ao5.
- How are the scrambles generated?
- In WCA notation (R, U', F2, Rw …), never turning the same face twice in a row. A 3×3 scramble of about 20 moves comes from a random position, so every position is equally likely.
- What are the 8 and 12 second sounds?
- They copy the judge's calls during inspection. Turn on "Sound at 8 s and 12 s" to hear them; they are off by default.
- Does the cube timer work on a phone?
- Yes. Hold the timer until it turns green, release to start, and tap to stop.