Riddlerr vs Zerko
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Riddlerr
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An excellent riddle game, with many different levels and varieties of riddles. Including math calculations, stereometry visualisation, attention and many more. Challenge you math skills, logical and creative vision.
Zerko
A relaxing puzzle game where you strategically place blocks to make all numbers on the board equal zero. Enjoy a no-pressure experience with calming audio and no in-app purchases or ads.
- Zero-sum number puzzles
- Strategic block placement
- Relaxing gameplay
- No time pressure
- No in-app purchases
- No ads
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Some call it reverse sudoku, while others call it a nullification game, but it's Zerko - a puzzle game filled with shapes, numbers, and a straightforward goal: make every number zero. To achieve this, you need to strategically place blocks of various shapes and values so that the numbers on the board effectively "remove up" to zero. Like all my games, this one too is about relaxation... Just chill. There are no points, no time pressure, no data collection, no in-app purchases, no ads, no nonsense ;) My only hope is that you'll enjoy it and that I'll be able to add new content and levels for you in the future. Relaxing audio by: Marek Koszczyński
Screenshots
Verdict
The clearest difference is price: Riddlerr at Free against Zerko's $2.99. Zerko's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.0). On update cadence, in-app purchases 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
Riddlerr is free to download; Zerko costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on August 4, 2026 and September 11, 2026 respectively.
| Parameter | Riddlerr | Zerko |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | — | 4.9 (14 ratings) — better |
| Positive reviews | — | 93.3% of reviews |
| Number of ratings | — | 14 — better |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | Vladyslav Yermakov | Maciej Targoni |
In-app purchases
Riddlerr
No in-app purchases
Zerko
No in-app purchases
