Comparison

Nordic Sudoku vs ECHO

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

About

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.

Highlights
  • Time-loop gameplay
  • 100 campaign levels
  • Daily puzzles
  • Endless Zen mode
  • Time challenge mode
  • Offline play
  • Live synthesized music
Features
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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

Nordic Sudoku4 screens
ECHO4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Nordic Sudoku ships an update daily, ECHO every 3 days. Both last shipped on October 31, 2026.

Scorecard1 real difference · 8 level
Nordic Sudoku versus ECHO: the parameters behind the verdict, then further details
ParameterNordic SudokuECHO
PriceFreeFree
Rating—4.0 (4 ratings) — better
Number of ratings—4 — better
Update frequencyDaily — betterEvery 3 days
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details — not scored
Size9 MB3 MB
Age rating4+4+
DeveloperChristopher BischoffLucas Hesseldieck

In-app purchases

None

Nordic Sudoku

No in-app purchases

None

ECHO

No in-app purchases

Questions

Is Nordic Sudoku free?
Nordic Sudoku is free to download, with no in-app purchases.
Is ECHO free?
ECHO is free to download, with no in-app purchases.
Do Nordic Sudoku or ECHO have ads?
Neither Nordic Sudoku nor ECHO shows ads.
Which is updated more often, Nordic Sudoku or ECHO?
Nordic Sudoku ships an update daily, and ECHO every 3 days. Most recently, Nordic Sudoku was updated on October 31, 2026 and ECHO on October 31, 2026.

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