Nordic Sudoku vs ECHO
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Nordic Sudoku
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Nordic Sudoku – Pure Sudoku. No Guessing. Just Logic. Experience Sudoku in its purest form. Nordic Sudoku combines minimalist Scandinavian design with a professional puzzle generator that guarantees every puzzle is solvable through logical thinking alone. Five Difficulty Levels From relaxing beginner puzzles to demanding challenges for experienced players: • Very Easy – Perfect for getting started • Easy – A gentle challenge • Medium – For practiced thinkers • Hard – Tests your logic • Very Hard – Masters only Intelligent Generator Every puzzle is crafted using advanced solving techniques – from simple singles to complex chains. This means: No puzzle requires guessing or trial-and-error. Every number can be found through pure logical deduction. Focus on What Matters • Clean, distraction-free design • Intuitive touch controls • Notes feature for candidates • Automatic progress saving Nordic Sudoku is for everyone who loves Sudoku – without ads, without distractions, without frustration.
ECHO
This puzzle game challenges you to cooperate with recordings of your past actions. Solve intricate levels by coordinating with your "echoes" to overcome obstacles and complete complex sequences.
- Time-loop gameplay
- 100 campaign levels
- Daily puzzles
- Endless Zen mode
- Time challenge mode
- Offline play
- Live synthesized music
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Your echoes are your teammates. ECHO is a time-loop puzzle: every run is recorded, and when you press ECHO, your past self replays it - step by step, loop after loop. Hold plates for each other, open doors across time, and thread paths no single runner could ever take. EASY TO LEARN, DEEP TO MASTER - 100 campaign levels across ten decades, from gentle first steps to choreographed finales - Mechanics that weave together: chained doors, counter-doors, double doors, fragile floors, beat walls, paradox boards and mirror echoes that replay your run backwards - Handcrafted signature levels where every single step must be planned FOUR WAYS TO PLAY - Campaign: 100 levels with a carefully tuned difficulty curve - Daily puzzle: one fresh board every day - keep your streak alive - Zen: endless generated puzzles in six difficulties - Time challenge: how many boards can you solve in one run against the clock? MADE WITH CARE - Completely offline: no account, no ads, no tracking, no data collection - Music is synthesized live on your device - no two sessions sound the same - Home-screen widget that grows with your streak - and hides a secret level - Game Center leaderboards and achievements - Available in 7 languages ECHO is free and complete from the first minute. The only purchases are voluntary tips for the developer - they unlock nothing. Your past self is waiting.
Screenshots
Verdict
The clearest difference is update cadence: Nordic Sudoku at daily against ECHO's every 3 days. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Nordic Sudoku ships an update daily, ECHO every 3 days. Both last shipped on October 31, 2026.
| Parameter | Nordic Sudoku | ECHO |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.0 (4 ratings) — better |
| Number of ratings | — | 4 — better |
| Update frequency | Daily — better | Every 3 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 9 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Christopher Bischoff | Lucas Hesseldieck |
In-app purchases
Nordic Sudoku
No in-app purchases
ECHO
No in-app purchases









