グレーターダン / レッサダン数独

9
7
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8
6
2
1
8
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7
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9
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9
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1
7
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2
9
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3
3
8
7
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5
9
7
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∧ ∧ ∨ › ‹ › ∧ ∨ › › ∧ ∨ ‹ ‹ ‹ ∧ ∧ ∨ › ‹ ∨ ∧ ‹ ∧ ‹ ‹ ∨ › ∧ ∧
ミス
0/3
スコア
-
時間
00:00
新規ゲーム
進捗0%
簡単 · グレーターダン 上記の難易度を切り替える ↑
グレーターダン / レッサダン数独の遊び方
標準数独ルールが適用されます。追加ルール: 隣接する2つのセル間の不等号(› ‹ ∧ ∨)は常に大きいセルから小さいセルを指します。A › B の場合、A > B。
完全ガイド →

セル間の不等号は、どちらが大きいかを制約します

グレーターダン / レッサダンとは?

グレーターダンスドク(フトシキスタイルスドクとも呼ばれる)は、隣接するセル間に<および>の不等号を配置します。記号は2つのセルのどちらが大きい値を保持しなければならないかを示します。いくつかのバリアントはすべての与えられた数字を不等号に置き換えます;他のものはハイブリッドを提供します。制約は推論の連鎖を作り出します:A > B > C > D の場合、A ≥ 4、B ≥ 3、C ≥ 2、D ≥ 1。

概要

制約タイプセルの関係
典型的な初期数字18–24
難易度評価 ★★★☆☆ 3/5
平均解答時間 — 簡単7分
平均解答時間 — ミディアム16分
平均解答時間 — 難しい32分
平均解答時間 — エキスパート58分

グレーターダン / レッサダン の解き方

テクニックそれが何をするかレベル
Chain Inequality — Minimums Link inequalities in a chain: if A > B > C, then A ≥ 3, B ≥ 2, C ≥ 1. Use these minimums to prune candidates immediately. 上級
Chain Inequality — Maximums In the chain A > B > C > D, also bound from above: A ≤ 9, B ≤ 8, C ≤ 7, D ≤ 6. 上級
Inequality Propagation After placing a digit, check all inequality arrows from that cell and eliminate impossible values from its neighbours. 上級
Forced Single via Range When an inequality chain reduces a cell's valid range to a single digit, place it directly. 上級

平均解答時間

簡単
7分
ミディアム
16分
難しい
32分
エキスパート
58分

よくある質問

Greater Than Sudokuとは何ですか?
Greater Than Sudoku is a variant where inequality signs (< and >) appear between adjacent cells. Each sign shows which of the two neighbouring cells must hold a larger digit. Standard Sudoku rules apply — every row, column, and box contains 1–9 exactly once.
How do I use the inequality clues?
Each inequality sign tells you the relative order of two neighbouring digits. If you see A > B, then A must be greater than B. You can chain inequalities — if A > B > C, then A is at least 3 and C is at most 7. Propagating minimum and maximum values through chains of inequalities is the core solving technique.
What is the most useful first move?
Find cells that sit at the end of a long chain of inequalities pointing toward them — these cells must hold either the minimum or maximum value in the chain. A cell where five arrows all point away from it must hold the largest digit in all five relationships; combined with Sudoku constraints this often pins the digit immediately.
Is Greater Than Sudoku harder than regular Sudoku?
It depends on difficulty level. Easy Greater Than puzzles are comparable to medium classic Sudoku. Hard and expert puzzles require systematic bound propagation across many overlapping inequality chains, which is substantially harder than any classic Sudoku difficulty.
Can I solve Greater Than Sudoku without arithmetic?
Mostly yes — the inequalities involve relative ordering, not sums or products. The key skill is tracking minimum and maximum possible values for each cell as constraints propagate. Some players find this more intuitive than cage arithmetic in variants like Killer or Arrow Sudoku.
How long does Greater Than Sudoku take to solve?
Easy puzzles take 8–18 minutes. Medium puzzles run 18–35 minutes. Hard puzzles average 35–65 minutes and expert puzzles can take over 90 minutes. Longer inequality chains dramatically increase solve time at hard and expert levels.
こちらもお試しください
クロッキー数独
Refines your adjacent-cell reasoning with exact relationships — difference of 1 and ratio of 2 instead of plain order.
XV数独
Adjacent pairs constrained by sums rather than order, with a negative constraint on every unmarked edge.
奇数 / 偶数 Sudoku
Another value-property variant: parity shading halves candidates the way your inequality chains bound them.
デイリーチャレンジ