Comparison

Crystal Scorpion Solitaire vs Doku!

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

Head to head
About

Crystal Scorpion Solitaire

Features
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Enter the Scorpion's lair and try not to get stung in this set of three Scorpion Solitaire variants! CLASSIC SCORPION (Expert) The classic 7-stack game with 4 hidden sets and three face-down spare cards to deal from the tail. Re-arrange the cards to build all four suits from King to Ace to win the round. You can pick up a pile of face-up cards from anywhere in the numbered stacks regardless of their suit and order, but can only drop them on a card of the same suit and one higher value than the bottom-most card. You can only place Kings on empty spaces! Click the scorpion's tail to deal the last cards when you get stuck - it won't sting you, but this game might! WASP (Regular) Very similar to Scorpion, this easier variant lets you place any card on an empty space, not just a King. Trust us, it makes a big, big difference and might just help you avoid the scorpion's claws! THREE BLIND MICE (Casual) An easier more relaxing variant where you have 10 stacks, 3 hidden sets and two face-up spare cards to use whenever you like! Challenge your friends to beat your high-scores, or just keep them to yourself and use the extensive statistics to keep track of your best games of Scorpion Solitaire. With clear and simple graphics, customisable cards, a full tutorial for absolute beginners we hope you will agree that this is the best version of this popular card game to be found. • 3 Difficulty levels to suit beginners to experts • Full tutorial to introduce you to the game gently • Regular or reversed card layouts for left or right handed play! • Customise the look of your cards, even how scruffy the dealing is! • Extensive statistics to track your improving skills • Simple & intuitive user interface, designed for young and old • Share your scores with your friends with Game Center leaderboards • Can you earn all the achievements? The Crystal Solitaire series of games have been some of the top online solitaire games on many sites, and now we have redesigned them for a whole new generation of devices so you can carry on playing your favourite solitaire game wherever you may be!

About

Doku!

This logic puzzle game challenges you to place dots on a board based on color regions and symbol clues. It offers a daily puzzle to maintain a streak and a journey mode with 150 levels across 11 chapters. Accessibility features and leaderboards are included.

Highlights
  • Daily logic puzzles
  • 150 levels across 11 chapters
  • Color vision palettes
  • Lettered regions for colorblindness
  • Daily and journey leaderboards
  • Offline puzzle solving
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Every colored region on the board hides one dot. The symbols on each tile tell you where a dot cannot go. Tap a square to pencil a note on it. Tap it twice to put a dot down. THE DAILY One board a day, the same board for everybody. Solve it and your streak goes up. The last seven days sit on the front page, so you can see which ones you got clean. THE JOURNEY 150 levels across 11 chapters, from a 4x4 that teaches you one rule at a time to the 9x9 boards at the end. Three chances per level. Solve one in the fewest moves it can be done in and it is marked perfect. ALSO IN IT - Palettes for deutan, protan and tritan color vision - A letter on every region for when the colors are hard to tell apart - Daily and journey leaderboards through Game Center - Every puzzle ships inside the app - No account and no sign up

Screenshots

Crystal Scorpion Solitaire4 screens
Doku!4 screens

Verdict

The call

The clearest difference is in-app purchases: Doku! at none against Crystal Scorpion Solitaire's 1. Doku! also leads on update cadence (daily vs every 8 months). On price, ads, 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. Crystal Scorpion Solitaire sells 1 one-off in-app purchase. Doku! asks for nothing beyond the download.

UpkeepUpdate frequency

Crystal Scorpion Solitaire ships an update every 8 months, Doku! daily. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

Scorecard2 real differences · 8 level
Crystal Scorpion Solitaire versus Doku!: the parameters behind the verdict, then further details
ParameterCrystal Scorpion SolitaireDoku!
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 8 monthsDaily — better
AdsYesYes
In-app purchasesYesNo — better
Monetization—Ad-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size17 MB79 MB
Age rating4+4+
DeveloperCrystal SquidPoliglot

In-app purchases

1 purchases

Crystal Scorpion Solitaire

One-time1
  • Remove Ads$2.99
None

Doku!

No in-app purchases

Questions

Is Crystal Scorpion Solitaire free?
Crystal Scorpion Solitaire is free to download, with in-app purchases available.
Is Doku! free?
Doku! is free to download, with no in-app purchases.
Do Crystal Scorpion Solitaire or Doku! have ads?
Both Crystal Scorpion Solitaire and Doku! show ads.
Which is updated more often, Crystal Scorpion Solitaire or Doku!?
Crystal Scorpion Solitaire ships an update every 8 months, and Doku! daily. Most recently, Crystal Scorpion Solitaire was updated on October 12, 2026 and Doku! on October 4, 2026.

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