Sudoku Speed Solving: Find Where the Time Goes

A faster total does not explain itself

A solve time combines several activities: finding deductions, entering values, maintaining notes, correcting errors and sometimes dealing with interruptions. If you want to explore speed, start by identifying which of those activities is taking your attention. “Tap faster” may address the smallest part of the session.

The following routine is a suggested way to inspect your own solving. It is not a study showing that a particular scan makes players faster. Nor are the example times benchmarks for a difficulty level. A comfortable pace and an understandable deduction remain reasonable goals on any board.

Choose a familiar mode and a fresh puzzle. Record assistance settings before starting. If the session is interrupted, mark that fact instead of quietly comparing its wall-clock time with an uninterrupted attempt.

Separate search, input and repair

For one practice session, make a rough note of where you stalled. You do not need to operate a stopwatch for every move. A retrospective description such as “searched the same box repeatedly” is already more useful than “slow.” The website does not automatically produce the three-part timing analysis shown below; it is an illustrative review framework.

If search dominated, ask whether you were asking a clear question or revisiting unchanged information. If input dominated, check selection, note mode and keyboard or touch controls. If repair dominated, identify the first unsupported deduction or wrong-cell entry. Those are different experiments for the next board.

A slower individual entry can still coexist with a shorter total if it avoids a lengthy repair, but this example does not establish that it will. Observe your own comparable sessions before deciding whether a change helped.

Give the next scan a reason

After placing a digit, inspect the houses it changed. When that local pass yields nothing, switch deliberately: one digit through several boxes, or one nearly completed house through its missing digits. This proposed routine gives each scan a defined question and a stopping point.

Avoid turning it into a rigid ritual that ignores an obvious deduction elsewhere. HoDoKu’s configurable solver order illustrates that different valid step orders can produce different paths. [2] A human practice routine can also be adjusted; it is not a universal fastest algorithm.

If you reach two candidates and cannot distinguish them, preserve them. A guess might produce quick entries before creating a later contradiction. The immediate movement of the timer or board does not establish that the decision was efficient.

Keep the task the same before comparing times

Consider two invented records: a fresh classic board with manual notes takes 9:20; a previously seen board with automatic candidates and an answer reveal takes 6:40. The second number is smaller. It does not isolate an improvement in unaided solving, because exposure and assistance changed.

Use the same source, mode, difficulty label and assistance settings for a more interpretable comparison. Prefer fresh puzzles. Record mistakes and hints beside time, and keep interrupted sessions identifiable. Even with those conditions aligned, individual boards are not identical tasks.

Pelánek’s difficulty research distinguishes complex steps from dependencies between steps. [1] That helps explain why two similarly labelled boards can create different stalls. A single personal best cannot establish a stable change in performance.

Try one small change, then review it

Choose a concrete question for a few comparable sessions: “Will following the houses changed by my last placement reduce repeated scanning?” Keep everything else as steady as practical. Record whether you actually followed the routine and what happened at the first stall. Do not declare success merely because one puzzle happened to be quick.

If the change creates awkwardness or more mistakes, adjust it. You may discover that input selection, not visual scanning, was the issue. A useful exercise can end with “this did not address my bottleneck.”

For ZUDOKU web play, respect the displayed eligibility state. Solver exposure, Auto Candidates or No mistakes can make a run practice-only, while hints affect the assistance and scoring record. [3] Use practice tools when they fit the lesson, but do not present an assisted time as an unassisted competitive result.

Finish with one sentence about where the time went and one next action. That is enough information to make the next session purposeful without turning a puzzle into a laboratory protocol.

Check your comparison