Why restraint works better than completeness

Full notation gives you information. Snyder gives you patterns. When a digit can only go in two places in a box, you’ve already done the hardest part of solving — you’ve narrowed it to a pair. Those pairs are the building blocks of every intermediate technique: pointing pairs, X-Wings, naked pairs, hidden pairs. By only writing the pairs, you make those patterns jump off the grid instead of hiding under a fog of candidates.

What this looked like in code

The interesting engineering problem wasn’t drawing the marks — it was deciding when to show them. I ended up adding two modes:

1. A one-tap auto-fill that writes every valid candidate (full notation) for players who want the safety net

2. A graduated hint system that surfaces Snyder-style pairs when a player gets stuck The second mode is what made the harder difficulty tiers (Master and Evil, at 17-19 givens) actually approachable for intermediate players. Without some kind of pattern surfacing, a 17-given puzzle is just a wall.

The takeaway If you’re stuck on hard sudokus and your grid looks like a candidate explosion, try the opposite: write less. Only mark digits restricted to two cells per box. You’ll see structure you were missing. I wrote a fuller breakdown of the technique with examples on the main site — the full Snyder notation guide is here — and the puzzles themselves are free to play if you want to try it out across difficulty levels.