Comparison

KenKen Classic vs Viper Puzzle

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

Head to head
About

KenKen Classic

Engage your mind with this addictive logic and math puzzle game. It offers a virtually unlimited supply of challenges with adjustable difficulty and grid sizes. Enjoy a fun way to train your brain with a trusted source of daily puzzles.

Highlights
  • Unlimited puzzles
  • Adjustable difficulty and grid size
  • Multiple input modes
  • Hints, Undo, Redo, Reset
  • Online leaderboards
  • Color schemes and music options
Features
Read full description

KenKen® - Brain Training Puzzle Train your brain with KenKen®, the unbelievably fun, exciting and addictive logic and math puzzle! KenKen is an amazing puzzle that is frequently described as “sudoku on steroids.” If you like other brain games such as sudoku, 2048, Threes, Kakuro, Unblock Me, Tricky Test, Tetris, Flow, jigsaw puzzles, word search puzzles, or crossword puzzles, then you will LOVE KenKen! This is the ONE-AND-ONLY Original KenKen app, created by acclaimed Japanese mathematics educator Tetsuya Miyamoto. Don’t be fooled by unauthorized versions such as mathdoku and calcudoku, and don't get stuck in a sudoku rut. Play KenKen math puzzles today! KenKen appears daily in the New York Times and hundreds of other publications around the globe. NY Times puzzle editor, Will Shortz, calls KenKen "the most addictive puzzle since sudoku." There are virtually unlimited KenKen puzzles available to you on this app. The first 50 are included FREE with the download. If you need more...no problem! Just order them and they'll appear immediately. YOU select the size, difficulty level, and operations. KenKen Classic includes: - 50 FREE fun math puzzles of every size and difficulty level - Unlimited FREE 3x3 size puzzles to learn from and enjoy - Virtually unlimited puzzles, ranging from 3x3 to 9x9 grids, from Easy to Expert - A variety of color schemes and music (you can even set your own music to play in the background) - 3 input modes for digits and notes - Great extra features such as Hints, Check, Undo, Redo, Reset, Pause, and Timer - Online leaderboards - Ability to post results directly to Twitter - Ability to email results and invite friends

About

Viper Puzzle

Experience a unique snake game where strategy and spatial reasoning replace reflexes. Navigate intricate levels, collect eggs to grow your snake, and master precise tap-to-turn controls. This game offers a satisfying puzzle experience for short bursts or extended play.

Highlights
  • Hand-crafted puzzle levels
  • Precise tap-to-turn controls
  • In-game tutorial
  • Collect eggs to grow snake
  • Multiple snake skins
  • Offline play
Features
Read full description

A fresh take on the classic snake game, with puzzles and a tutorial that teaches you the moves. VIPER is a snake puzzle game built around precise, tap-to-turn controls. Each level is hand-designed: glide along walls, time your turns through tight corridors and eat eggs to grow longer. FEATURES • Dozens of hand-crafted levels, sorted from easy to brain-bending • Tap-to-turn controls (left tap = counter-clockwise, right tap = clockwise) — fast to learn, satisfying to master • A first-play tutorial that walks you through the moves • Eggs to eat into new snake segments • Multiple snake skins — pick the look that fits your mood • Haptic feedback and optional sound • Plays great offline, anywhere WHY VIPER Most snake games are about reflexes. VIPER is about reading the board. Every level is a small spatial puzzle: where do you turn, when do you turn, and which path leaves you room to grow? Levels start simple and gradually layer in eggs, wormholes, and tighter geometry until you're planning three moves ahead. Whether you're killing five minutes on a commute or settling in for a long session, VIPER is designed to feel good in your hand and respect your time.

Screenshots

KenKen Classic2 screens
Viper Puzzle3 screens

Verdict

The call

The clearest difference is in-app purchases: Viper Puzzle at none against KenKen Classic's 6. Viper Puzzle also leads on ads (none vs shown) and update cadence (fortnightly vs every 4 months). KenKen Classic's advantage is ratings volume (3.2K vs 1). On price, device support and iOS requirement 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. KenKen Classic sells 6 in-app purchases, starting at $19.99 per year. Viper Puzzle asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Viper Puzzle holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: KenKen Classic has 3.2K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 73% of KenKen Classic's written reviews are positive against 100% of Viper Puzzle's.

UpkeepUpdate frequency

KenKen Classic ships an update every 4 months, Viper Puzzle fortnightly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard7 real differences · 3 level
KenKen Classic versus Viper Puzzle: the parameters behind the verdict, then further details
ParameterKenKen ClassicViper Puzzle
PriceFreeFree
Rating4.6 (3.2K ratings)5.0 (1 ratings) — better
Positive reviews72.7% of reviews100.0% of reviews — better
Number of ratings3.2K — better1
Update frequencyEvery 4 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.1 — better13.0
Further details — not scored
Size40 MB41 MB
Age rating4+4+
DeveloperKenKen PuzzleCESARE CELOZZI

Customer experience

KenKen Classic

All ratings3,172 ratings
Positive92.7%
Neutral2.6%
Negative4.6%
Written reviews315 reviews
Positive72.7%
Neutral9.5%
Negative17.8%

Viper Puzzle

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

KenKen Classic

Reported bugs

3 issues
  • Puzzles disappearing after device reset or upgrade
  • Purchased puzzles not syncing across devices
  • App crashing or freezing

Requested features

4 requests
  • Dark mode option
  • Ability to save and revert puzzle progress
  • No-op puzzles for advanced players
  • Improved puzzle loading and syncing across devices

Viper Puzzle

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

KenKen Classic

Subscriptions1
  • Full Year Subscription NO ADS!$19.991 Year
One-time5
  • 500 KenKen toKENs$0.99
  • 31 Puzzles PLUS removal of all ads!$1.99
  • 250 Puzzles PLUS removal of all ads!$7.99
Show 2 more
  • 1000 Puzzles PLUS removal of all ads!$14.99
  • Annual Unlimited Subscription - Ad Free$19.99
None

Viper Puzzle

No in-app purchases

Questions

Is KenKen Classic free?
KenKen Classic is free to download, with in-app purchases available.
Is Viper Puzzle free?
Viper Puzzle is free to download, with no in-app purchases.
Which has better reviews, KenKen Classic or Viper Puzzle?
Viper Puzzle is rated higher. KenKen Classic averages 4.6 out of 5 from 3.2K ratings, while Viper Puzzle averages 5.0 from 1 ratings.
Do KenKen Classic or Viper Puzzle have ads?
KenKen Classic shows ads; Viper Puzzle does not.
Which is updated more often, KenKen Classic or Viper Puzzle?
KenKen Classic ships an update every 4 months, and Viper Puzzle fortnightly. Most recently, KenKen Classic was updated on November 1, 2026 and Viper Puzzle on October 31, 2026.

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