Speed Solving

Whether you're competing on leaderboards or just want to shave minutes off your personal bests, speed solving is a distinct skill from solving correctly. Here's how to get faster.

The Speed Mindset

Speed vs. Accuracy

Going fast means nothing if you make errors. The goal is:

Minimum time to correct solution

Errors force you to:

  • Stop and diagnose
  • Undo multiple moves
  • Possibly restart entirely

A single error can cost more time than a careful approach saves. Build speed on a foundation of accuracy.

What Actually Costs Time

Most solving time goes to:

  1. Searching — Looking for the next move
  2. Deciding — Choosing what to do
  3. Executing — Actually making inputs
  4. Recovering — Fixing mistakes

Ranked by impact, searching and deciding dominate. Execution is fast if you know your controls. Recovery should be rare.

Optimizing Search

The Systematic Scan

Random scanning wastes time revisiting cells. Use a pattern:

The Snake Scan:

Row 1: → → → → → → → → →
Row 2: ← ← ← ← ← ← ← ← ←
Row 3: → → → → → → → → →
(continue alternating)

The Box Spiral:

Box 1 → Box 2 → Box 3
                  ↓
Box 4 ← Box 5 ← Box 6
↓
Box 7 → Box 8 → Box 9

Pick a pattern and make it automatic. Consistency beats cleverness.

Visual Anchoring

Don't just scan — anchor on high-value cells:

  • Cells with few candidates — Close to solvable
  • Nearly-complete units — High chance of singles
  • Recently changed areas — New constraints create opportunities

Train your eyes to snap to these locations.

Peripheral Recognition

Expert solvers don't look at every cell equally. They:

  • See patterns in peripheral vision
  • Recognize digit distributions at a glance
  • Spot constraint violations without focused attention

This develops with practice. Thousands of puzzles train your visual system.

Optimizing Decisions

Pre-computation

Before the timer starts (or while mentally preparing):

  • Scan for gimme placements
  • Identify the most constrained regions
  • Note which digits are nearly complete

This front-loads decisions so execution flows smoothly.

Decision Hierarchies

When multiple moves are possible, prioritize:

  1. Certain placements — Singles you can execute immediately
  2. High-impact eliminations — Opens multiple cells
  3. Information-gathering — Noting for later

Don't analyze everything equally. Place what you can, skip what you can't.

Avoid Analysis Paralysis

If you can't see a move within 3-5 seconds:

  • Move on
  • Mark the area mentally
  • Return after more constraints develop

Time spent staring rarely produces insights. Movement produces information.

Optimizing Execution

Master Your Controls

Input speed matters. Know your app's controls cold:

Essential shortcuts:

  • Number input (1-9 keys)
  • Note mode toggle
  • Erase/clear
  • Undo

Navigation:

  • Arrow key movement
  • Click/tap accuracy
  • Quick cell selection

Goal: Zero hesitation between deciding and doing.

Minimize Mode Switching

Switching between placing and noting interrupts flow:

Batching strategy:

  • Place all certain digits first
  • Switch to note mode
  • Make all notes at once
  • Switch back and continue

Fewer mode switches = smoother rhythm.

Two-Hand Technique

If using keyboard and mouse/trackpad:

  • One hand on number keys
  • One hand for navigation
  • Never reach across

If touch-only:

  • Tap cell, tap number
  • Minimize tap distance
  • Use both thumbs if comfortable

Speed Techniques by Difficulty

Easy Puzzles (Target: Under 3 minutes)

Strategy: Pure scanning, minimal notes

  • Cross-hatch aggressively
  • Don't bother with notes — just scan
  • Nearly-complete units first
  • Flow continuously; don't stop to think

Key technique: Naked singles from visual inspection

Medium Puzzles (Target: 3-6 minutes)

Strategy: Scan first, notes only when stuck

  • Start with full scan for obvious placements
  • When stuck, add notes to the most constrained region only
  • Look for hidden singles and naked pairs
  • Return to scanning after each breakthrough

Key technique: Partial noting in targeted areas

Hard Puzzles (Target: 6-15 minutes)

Strategy: Systematic notes, pattern hunting

  • After initial scan, set up notes in key regions
  • Actively hunt for pairs and pointing patterns
  • Don't overanalyze — place what you can, move on
  • Accept that some puzzles require intermediate techniques

Key technique: Efficient note management

Expert+ Puzzles (Target: 15+ minutes)

Strategy: Full notes, advanced techniques

  • Speed comes from technique mastery, not rushing
  • Set up complete notes early
  • Systematically apply advanced techniques
  • Accept that these puzzles take time

Key insight: At this level, technique knowledge beats raw speed

Training Exercises

The Scan Drill

  1. Load an Easy puzzle
  2. See how many cells you can place in 60 seconds using only scanning
  3. Don't set up notes, don't analyze — just scan and place
  4. Track your count over time

Goal: Train rapid pattern recognition

The Notation Race

  1. Load a Hard puzzle
  2. Time how long it takes to set up full notes (without placing anything)
  3. Practice until you can note quickly and accurately
  4. Then time full solve

Goal: Fast, accurate note setup

The Technique Sprint

  1. Pick a single technique (e.g., naked pairs)
  2. Load puzzles that feature it
  3. Practice finding and executing just that technique
  4. Time how long it takes to spot the pattern

Goal: Instant pattern recognition for each technique

The Mistake Recovery Drill

  1. Intentionally make a wrong placement
  2. See how quickly you can detect and fix it
  3. Practice recognition of contradiction states

Goal: Minimize damage from errors

Metrics That Matter

Track Your Times

Record your solving times by difficulty:

  • Best time (peak performance)
  • Average time (typical performance)
  • Standard deviation (consistency)

Consistency matters more than occasional fast times.

Identify Bottlenecks

After each solve, ask:

  • Where did I slow down?
  • What patterns did I miss initially?
  • Were my notes efficient?
  • Did I make errors?

Targeted practice beats generic grinding.

Progress Indicators

Signs you're improving:

  • Fewer cells remaining when "stuck"
  • Faster note setup
  • Quicker pattern recognition
  • Lower error rate
  • More consistent times

Common Speed Traps

The "Check Everything" Trap

Verifying every placement thoroughly is slow:

  • Trust your pattern recognition
  • Check systematically but not obsessively
  • Let the grid tell you when something's wrong

The "Perfect Notes" Trap

Over-maintaining notes:

  • Full notes aren't always needed
  • Sometimes quick and dirty beats thorough and slow
  • Notes are a means, not an end

The "Complex Technique" Trap

Hunting for advanced patterns on easy puzzles:

  • Basic techniques solve most cells
  • Advanced techniques are for specific stuck points
  • Don't show off; be efficient

The "Comparison" Trap

Watching top solvers and feeling slow:

  • Elite speed requires thousands of hours
  • Compare to your past self
  • Small improvements compound

Practical Tips

Warm up:

  • Do 2-3 easy puzzles before timed attempts
  • Gets your pattern recognition flowing
  • Warms up motor memory

Environment:

  • Good lighting
  • Comfortable position
  • Minimal distractions
  • Consistent setup

Mental state:

  • Light pressure helps; heavy pressure hurts
  • Some tension keeps you sharp
  • Too much tension causes errors

After mistakes:

  • Don't dwell
  • Fix and move on
  • Review after the solve, not during

Quick Reference

Speed priorities:

  1. Accuracy first (errors are expensive)
  2. Systematic scanning (don't revisit cells)
  3. Efficient decisions (don't over-analyze)
  4. Fast execution (know your controls)

Time allocation:

  • 10% warming up
  • 60% scanning and placing
  • 25% analyzing and noting
  • 5% recovering from stuck points

Practice focus:

  • Pattern recognition drills
  • Input speed
  • Technique mastery
  • Consistency over peak performance