Comparison

Sudoku vs Rainbow Piece

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

Head to head
About

Sudoku

A vibrant twist on the classic logic game, this app uses colors instead of numbers to challenge your mind. Solve puzzles with intuitive design and adjustable difficulty levels. Enjoy endless, beautifully crafted boards offline.

Highlights
  • Color-based Sudoku puzzles
  • Adjustable difficulty levels
  • Hint system
  • Endless puzzles
  • Offline play support
  • Clean, user-friendly interface
Features
Read full description

Sudoku — but make it colorful. Sudoku: Color replaces numbers with 9 vibrant hues, making every puzzle a visual delight that's easy to pick up and impossible to put down. HOW IT WORKS Fill every row, column, and 3×3 box with all 9 colors — no repeats. The same satisfying logic as classic Sudoku, but the color format welcomes newcomers while keeping all the depth veterans love. FOUR WAYS TO PLAY → New Game — choose Breezy, Easy, Medium, Hard, or Expert difficulty → Daily Challenge — a new puzzle every day with a unique twist: No Mistakes mode, Time Attack, or Hintless runs. Build your streak. → Expert Mode — wrong placements are allowed. Spot and fix your own mistakes. Every undo counts. → Online Multiplayer — race real opponents over the internet. Share a room code, get matched in seconds, and settle it with an instant rematch. BEAUTIFUL BY DESIGN • 7 hand-crafted color palettes: Original, Horizon, Spring, Summer, Autumn, Winter, and the dark Nightmare Pack • Light & dark themes that follow your system setting • Clean, distraction-free board built for touchscreens ACHIEVEMENTS & LEADERBOARDS • 70 achievements: speed runs, perfect games, streaks, combos, and more • Game Center leaderboards — compete for the fastest times globally • Daily streak tracker with 7-day calendar view SMART FEATURES • Auto-notes instantly show all valid candidates • Color conflict highlighting and remaining-count badges • Procedural sound effects and haptic feedback • Full game save — resume exactly where you left off Free to play. Remove Ads and the Nightmare Palette Pack are available as optional purchases.

About

Rainbow Piece

Features
Read full description

Rainbow Piece: Relaxing Circular Jigsaw. Escape the stress of high scores. Enjoy a pure, calm puzzle experience on your wrist. 【How to Play】 - Move: Drag your finger on the screen to move the pieces. - Rotate: Turn the Digital Crown to rotate the selected piece. 【Choose Your Challenge】 - Normal: Relatively easy, as you solve the puzzle by following the rainbow color gradient. - Hard: Solve the puzzle by relying solely on the shape of the pieces. 【Two Sizes Available】 - 13 Pieces: Large pieces and a small number of pieces make for a casual game. - 25 Pieces: Small pieces and a large number of pieces make for a more thorough game. 【Tip】 Long press the screen any time to return to the start screen. Take your time. Find your peace. Complete the rainbow.

Screenshots

Sudoku4 screens

Verdict

The call

The clearest difference is in-app purchases: Rainbow Piece at none against Sudoku's 2. Rainbow Piece also leads on ads (none vs shown). Sudoku's advantage is update cadence (every 3 weeks vs every 3 months) and iOS requirement (17.0 vs 26.0). On price 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. Sudoku sells 2 one-off in-app purchases. Rainbow Piece asks for nothing beyond the download.

UpkeepUpdate frequency

Sudoku ships an update every 3 weeks, Rainbow Piece every 3 months. The most recent releases landed on September 26, 2026 and September 30, 2026 respectively.

Scorecard4 real differences · 6 level
Sudoku versus Rainbow Piece: the parameters behind the verdict, then further details
ParameterSudokuRainbow Piece
PriceFreeFree
Rating4.3 (15 ratings) — better—
Positive reviews60.0% of reviews—
Number of ratings15 — better—
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationAd-supported—
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS17.0 — better26.0
Further details — not scored
Size7 MB1 MB
Age rating4+4+
DeveloperNykylo Media LLCKiyoshi Izumi

In-app purchases

2 purchases

Sudoku

One-time2
  • Nightmare Pack$0.99
  • Remove Ads$1.99
None

Rainbow Piece

No in-app purchases

Questions

Is Sudoku free?
Sudoku is free to download, with in-app purchases available.
Is Rainbow Piece free?
Rainbow Piece is free to download, with no in-app purchases.
Do Sudoku or Rainbow Piece have ads?
Sudoku shows ads; Rainbow Piece does not.
Which is updated more often, Sudoku or Rainbow Piece?
Sudoku ships an update every 3 weeks, and Rainbow Piece every 3 months. Most recently, Sudoku was updated on September 26, 2026 and Rainbow Piece on September 30, 2026.

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