Comparison

Clear Sudoku 9 vs SYSCALL

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

Head to head
About

Clear Sudoku 9

This Sudoku app prioritizes clarity with large, bold numbers and a clean interface. Enjoy a comfortable puzzle experience with intuitive controls, adjustable difficulty, and daily challenges. Play offline without ads or accounts.

Highlights
  • Large, bold numbers
  • Clean, uncluttered board
  • Simple, intuitive controls
  • Adjustable difficulty levels
  • Daily challenges
  • Progress tracking
  • Offline play
Features
Read full description

Finally, a Sudoku app that's easy to see and easy to play. Clear Sudoku 9 is designed with clarity in mind. Large, bold numbers. A clean, uncluttered board. Simple, intuitive controls. No squinting, no confusion — just the classic number puzzle you know and love, made comfortable for everyone. LARGE, CLEAR NUMBERS Every digit on the board is big, bold, and easy to read. No tiny text, no cramped grids. The entire interface is designed so you can see everything at a glance — even without your reading glasses. SIMPLE TO USE • Tap a cell, tap a number — that's it • Big, easy-to-press number buttons • Undo any move with one tap • Gentle error highlighting helps you catch mistakes • Helpful hints when you need a nudge in the right direction START AT YOUR OWN PACE Begin with Easy puzzles — they're relaxing and satisfying, perfect for unwinding. When you're ready, try Medium, Hard, or Expert. There's no rush and no pressure. You can even hide the timer! DAILY CHALLENGES A fresh puzzle every day, matched to your skill level. A wonderful part of your daily routine — enjoy your morning coffee with your morning puzzle. KEEP TRACK OF YOUR PROGRESS • See how many puzzles you've completed • Watch your winning streak grow • Earn stars based on how well you do • Celebrate personal best times • Earn achievement badges for milestones COMFORTABLE DESIGN • Clean, spacious layout — nothing cluttered or distracting • Choose light mode for daytime or dark mode for evenings • Works beautifully on iPhone, iPad and iPhone Duo • iPad shows an extra-large board — perfect for comfortable play • On iPhone Duo, play on the outer screen or unfold for a bigger board with the number pad right beside it NO ADS. NO ACCOUNTS. NO INTERNET NEEDED. Clear Sudoku 9 is just $1.99, with no advertising, no sign-ups, and no internet connection required. It works everywhere — at home, on the go, or on a plane. YOUR PRIVACY IS PROTECTED We collect absolutely no data. No tracking, no analytics, nothing. Your puzzles and progress stay on your device and nowhere else. AVAILABLE IN YOUR LANGUAGE Enjoy the app in English, German, Greek, Spanish, French, or Italian. Download Clear Sudoku 9 today and rediscover the joy of Sudoku — clear, comfortable, and designed for you.

About

SYSCALL

Engage in a unique reverse-engineering and assembly optimization puzzle game set within a 1990s warez BBS. Write and debug assembly programs to crack software, patch code, and navigate a virtual network. Explore a private board with tools and community features.

Highlights
  • Reverse-engineering assembly puzzles
  • Code tracing and patching
  • Network hacking challenges
  • Virtual BBS environment
  • Assembly pixel art tool
  • Chip-tune maker
Features
Read full description

The mobile version of the SYSCALL: RING ZERO assembly puzzle game is here! This is our world now. The world of the electron and the switch. SYSCALL is a reverse-engineering and assembly optimization puzzle game inside a private 1990s warez BBS. You will be writing assembly programs, reading listings, tracing the machine, changing the code, and shipping the crack. READ THE CODE THAT RUNS Every CRACK release is a small SYSCALL CORE program. You are able to trace programs, inspect assembly instructions, get hints and watch registers move, in order to find the way to TRACE, CRACK and PATCH programs. FOUR WAYS TO HACK THE NETWORK CRACK: Read the listing, find the secret input key, and bypass the protection. PATCH: Fit the smallest fix into fixed edit slots, then run the test battery. WORM: Program a dynamic up to nine-core rack, route values across ports, and cut lines and cycles. SCOPE: Write firmware until the live trace locks onto the ghost signal. A PRIVATE BOARD WITH REAL TOOLS Dial in, pick a node on the NETWORK MAP, read the mail, check the notes, and work the releases. The board has PHILES that teach the SYSCALL CORE, crew messages, NFOs, greets, records, and side tools. CANVAS is a freeform assembly pixel toy. TRACKER is a four-channel chip-tune maker you can set as the board music.

Screenshots

Clear Sudoku 94 screens
SYSCALL4 screens

Verdict

The call

The clearest difference is review sentiment: Clear Sudoku 9 at 67% against SYSCALL's 0%. Clear Sudoku 9 also leads on rating (5.0 vs 4.0). SYSCALL's advantage is price (Free vs $1.99). On ratings volume, update cadence, ads and in-app purchases 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

SYSCALL is free to download; Clear Sudoku 9 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Clear Sudoku 9 holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 67% of Clear Sudoku 9's written reviews are positive against 0% of SYSCALL's.

UpkeepUpdate frequency

Clear Sudoku 9 ships an update every 9 days, SYSCALL every 11 days. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard3 real differences · 7 level
Clear Sudoku 9 versus SYSCALL: the parameters behind the verdict, then further details
ParameterClear Sudoku 9SYSCALL
Price$1.99Free — better
Rating5.0 (2 ratings) — better4.0 (1 ratings)
Positive reviews66.7% of reviews — better0.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 9 days — betterEvery 11 days
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size2 MB18 MB
Age rating4+4+
DeveloperTheano BertsiaChilling Moose

Customer experience

Clear Sudoku 9

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

SYSCALL

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Clear Sudoku 9

No in-app purchases

None

SYSCALL

No in-app purchases

Questions

Is Clear Sudoku 9 free?
Clear Sudoku 9 costs $1.99, with no in-app purchases.
Is SYSCALL free?
SYSCALL is free to download, with no in-app purchases.
Which has better reviews, Clear Sudoku 9 or SYSCALL?
Clear Sudoku 9 is rated higher. Clear Sudoku 9 averages 5.0 out of 5 from 2 ratings, while SYSCALL averages 4.0 from 1 ratings.
Do Clear Sudoku 9 or SYSCALL have ads?
Neither Clear Sudoku 9 nor SYSCALL shows ads.
Which is updated more often, Clear Sudoku 9 or SYSCALL?
Clear Sudoku 9 ships an update every 9 days, and SYSCALL every 11 days. Most recently, Clear Sudoku 9 was updated on October 24, 2026 and SYSCALL on October 26, 2026.

Other comparisons