Zerko

Zerko

Rainbow Train
★★★★★ 4.6 Puzzle v1.1 5,000+
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Zerko Screenshot 1Zerko Screenshot 2Zerko Screenshot 3Zerko Screenshot 4Zerko Screenshot 5Zerko Screenshot 6
Version
1.1
Downloads
5,000+
Updated
Oct 4, 2025
Developer
Rainbow Train
Category
Puzzle
Content Rating
Everyone
Package
com.rainbowtrain.zerko
Platform
Android

Download Sources

Device Configuration

Split APKs Installation Guide

Some apps are distributed as Split APKs (multiple .apk files packaged together) to optimize resources. Standard Android installers cannot open them.

1. Download Split APKs Installer (SAI) from Google Play Store.
2. Download the app archive (.apks) using the download sources listed above.
3. Open SAI, click "Install APKs", choose the downloaded archive, and click Install.

What's New

- Bug fix

About this app

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

User Reviews

Brian Gergens Feb 13, 2025
★★★★★

As Rainbow Train games go, it's not my favorite, but as a basic math puzzle, it's pretty neat. In keeping with your expectations, it's quite nicely made, with pleasant sounds and gameplay. The offset between the position of your finger and the block is a little frustrating, makes it hard to play in portrait, but it's still a nice, pleasant little game worth your time.

Arn Liac Mar 23, 2025
★★★★★

another great masterpiece of minimalist puzzles. I usually am terrible at math puzzles games and I avoid them. but as usual, rainbow train does an excellent job easing players into the game via small easy puzzles that gently teach the player the game mechanics. then slowly increasing the difficulty level but it never feels too difficult. this game was very easy to learn and very enjoyable from start to finish. it helps that the game auto calculates the math for the player. thanks!

Elizabeth West Mar 7, 2026
★★★☆☆

Puzzles are excellent but either they need to be more challenging or there needs to be far more levels to make the price worth it. Finished the whole game in the time it took to have a pot of coffee

Paul Gray Apr 1, 2024
★★★★★

Superlative, as always, from Rainbow Train, everything they do is always amazing. I reeeeaaalllyy hope they release more levels for this game, as I finished it in under a week. I'm not saying it's easy, just it's so addictive and fun that I was compelled to keep playing and complete it.

How to Download Zerko APK

  1. Enter the package name com.rainbowtrain.zerko on the APK Downloader.
  2. Select your device architecture (ARM64 recommended for modern devices).
  3. Click Download to get the merged APK file.
  4. Transfer and install the APK on your Android device.
  5. Keep Updated: Visit APKDER.COM regularly to search for and download the latest secure versions of your favorite apps.

Security & Signature Verification

This APK download is 100% safe. We verify that the cryptographic signature of the file matches the official developer credentials. No modifications or adware are injected.

Other Basic Access
  • Google Play license check

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