Playing Prague vs Calc Ninja
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Playing Prague
A relaxing puzzle game where you bring Prague to life by matching cards featuring ancient symbols. Uncover iconic landmarks and historical figures as you progress through handcrafted levels, celebrating the city's rich cultural heritage.
- Relaxing puzzle gameplay
- Iconic Prague landmarks
- Historical personalities
- City building elements
- Logical pattern composition
- Hand-crafted levels
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Playing Prague is a relaxing puzzle game in which Prague comes to life at your fingertips. Discover this Bohemian city with playing cards featuring the ancient symbols of Prague houses. Match the right cards and each level will reveal new iconic landmarks such as the Charles Bridge, the Prague Astronomical Clock, Prague Castle or the Petřín Tower. Along the way, you will meet Kafka, Einstein, Mozart and other personalities whose fate is linked to Prague. Every detail of the game is a tribute to the 1000-year cultural heritage of a city that was once the seat of the Holy Roman Emperors and the capital of the Bohemian Kingdom. It is also the origin of the designation of bohemians as people with a creative and unconventional way of life. Playing Prague offers: • A combination of city building and logical pattern composition • Six hand-crafted levels with iconic Prague landmarks and ten more available to purchase • Collector’s set of monuments and historical personalities • A challenge for experienced puzzle fans and casual players alike The free base game contains one level pack including 6 levels. Two additional packs (5+5 levels) are available to purchase. Support the development of the game and get new puzzles and additional historical content! This game is a celebration of Prague and all those who have shaped and continue to shape this beautiful city. All about Prague can be found at prague.eu
Calc Ninja
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Calc Ninja is a mental-math battle puzzle. Fill the blanks in each equation to strike down the oni! How to play 1. Each battle shows an equation with blank tiles, e.g. ( □ + □ ) × □ = 18. 2. Tap number tiles to fill the blanks so the equation is true. 3. A correct answer strikes the demon; a wrong answer or running out of time lets it strike you. Content - 30 scrolls across 6 ninja ranks (Shoden to Gokui) - 16 unique oni bosses with a demon gallery - Operators and parentheses stay fixed. You only place the numbers, so it is pure mental math. Great for - Adults who want daily brain training - Anyone who likes number puzzles and quick arithmetic - Fans of a Japanese ninja-and-oni theme Free to play. No account required. * This app is a work of fiction. Characters and story are not based on real people or events.
Screenshots
Verdict
The clearest difference is in-app purchases: Calc Ninja at none against Playing Prague's 2. Playing Prague's advantage is ads (none vs shown) and update cadence (every 4 days vs monthly). On price 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
Both are free to download. Playing Prague sells 2 one-off in-app purchases. Calc Ninja asks for nothing beyond the download.
Playing Prague ships an update every 4 days, Calc Ninja monthly. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.
| Parameter | Playing Prague | Calc Ninja |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 4 days — better | Monthly |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 276 MB | 118 MB |
| Age rating | 4+ | 9+ |
| Developer | Charles Games s.r.o. | kotaro yamada |
In-app purchases
Playing Prague
- Extra levels: Bells & Unicorns$3.99
- Extra levels: Boats & Pears$3.99
Calc Ninja
No in-app purchases









