Comparison

Killer Sudoku by Sudoku.com vs Memory Trail

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

Head to head
About

Killer Sudoku by Sudoku.com

Engage your mind with this number puzzle game, offering thousands of levels and daily challenges. It provides a unique twist on classic sudoku with cage-based sum puzzles, suitable for all skill levels. Hints and notes are available to help you master the game.

Highlights
  • Thousands of Killer Sudoku levels
  • Daily challenges with unique trophies
  • Seasonal events for special medals
  • Hints and notes for assistance
  • Enhanced gameplay for all skill levels
  • Brain-training puzzles
Features
Read full description

Enjoy an engaging Killer Sudoku experience! Jump into enhanced gameplay, solve tons of puzzles, train your brain, and have fun! Discover the new brain-training puzzle from the developer of Sudoku.com! Killer Sudoku by Sudoku.com is great for both beginners and advanced players. Although Killer Sudoku is harder than classic sudoku, we made it accessible for players of all skill levels. With its enhanced gameplay, it's easy to follow the game rules and become a sudoku master in no time. Explore Killer Sudoku and discover a refreshing take on the classic paper-and-pencil sudoku puzzle. What you get: * Killer Sudoku puzzles to expand your sudoku experience. * Thousands of levels to solve. * Daily challenges to win unique trophies. * Seasonal events to get unique medals. * Hints and notes to guide you when you get stuck. * Tons of gameplay to challenge your brain. * New game from a top developer! How to play: * Fill all rows, columns, and 3x3 regions with numbers exactly like classic sudoku. * Every cell is part of a cage, indicated by dotted lines. * Make sure the cells can be added up to the sum in the upper left corner of the cage. * The sum of all numbers of each 3x3 region, row or column always equals to 45. * Numbers cannot repeat within cages, a single row, column, or 3x3 region. Dive into the world of Killer Sudoku! Play anywhere, anytime!

About

Memory Trail

Features
Read full description

Venture into the wild and sharpen your memory with this exciting jungle-themed puzzle game! Each level challenges you with a grid of blocks—3x3, 4x4, or more. The blocks blink one by one in a specific pattern. Your mission? Memorize the sequence and tap the blocks in the same order to pass the level. As you go deeper into the jungle, the patterns get longer and faster. Keep your focus sharp and your memory sharper! - Key Features - Jungle-Themed Environment – Immerse yourself in lush visuals and natural sounds. - Memory Puzzle Gameplay – Watch, remember, and repeat blinking patterns. - Varied Grid Sizes – Tackle increasing challenges with 3x3, 4x4, and more. - Progressive Difficulty – Patterns grow more complex as you advance. - Easy Controls – Just tap the blocks in the correct sequence. - Achievements & Rewards – Unlock milestones as you master levels. - Replayable Fun – Randomized patterns ensure a fresh experience every time. - Immersive Audio – Jungle ambience helps keep you focused and in the zone.

Screenshots

Killer Sudoku by Sudoku.com4 screens
Memory Trail4 screens

Verdict

The call

The clearest difference is in-app purchases: Memory Trail at none against Killer Sudoku by Sudoku.com's 1. Memory Trail also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads 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. Killer Sudoku by Sudoku.com sells 1 one-off in-app purchase. Memory Trail asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 7, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Killer Sudoku by Sudoku.com versus Memory Trail: the parameters behind the verdict, then further details
ParameterKiller Sudoku by Sudoku.comMemory Trail
PriceFreeFree
Rating4.7 (219K ratings) — better—
Positive reviews44.9% of reviews—
Number of ratings219K — better—
Update frequencyEvery 2 monthsEvery 2 months
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size237 MB75 MB
Age rating12+17+
DeveloperEasybrain LtdCITUAL Technologies OPC Private Limited

Bugs and requests

Killer Sudoku by Sudoku.com

Reported bugs

5 issues
  • Incorrect puzzle solutions
  • Scoring and stats issues
  • Screen orientation problems
  • Game freezing and crashing
  • Unresponsive controls

Requested features

6 requests
  • Option to toggle number combinations
  • Ability to lock correct numbers
  • Improved hint system
  • Customizable font and color options
  • Progress sync between devices
Show 1 more
  • Difficulty level adjustments

Memory Trail

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Killer Sudoku by Sudoku.com

One-time1
  • Killer Sudoku No Ads$14.99
None

Memory Trail

No in-app purchases

Questions

Is Killer Sudoku by Sudoku.com free?
Killer Sudoku by Sudoku.com is free to download, with in-app purchases available.
Is Memory Trail free?
Memory Trail is free to download, with no in-app purchases.
Do Killer Sudoku by Sudoku.com or Memory Trail have ads?
Both Killer Sudoku by Sudoku.com and Memory Trail show ads.
Which is updated more often, Killer Sudoku by Sudoku.com or Memory Trail?
Killer Sudoku by Sudoku.com ships an update every 2 months, and Memory Trail every 2 months. Most recently, Killer Sudoku by Sudoku.com was updated on November 7, 2026 and Memory Trail on October 25, 2026.

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