A simple memory game for kids aged 4+. No ads, no accounts, no complicated screens: pick a theme, pick a difficulty, find the pairs before the clock runs out.
- 3 themes: Animals, Monsters and Emojis
- 6 difficulties, from 3x2 up to 10x5 cards
- Stars and best times per level, sounds on winning
2014 to 2019. The game was written in Java, released on Google Play as Memory Game (Free) and published here as open source. The last release was version 1.01.001007 in February 2019.
2019 to 2026. Maintenance stopped. Google Play removed the app in November 2019 for not keeping up with its developer policies, and the code sat still while Android moved on by twelve API levels.
2026. The revival. The whole app was converted from Java to Kotlin, restructured, debugged, tested and prepared for release purely with AI (Claude Code), with the original artwork and gameplay kept intact. It is on its way back to the store.
Standard Android Studio project: Kotlin, AndroidX, Gradle Kotlin DSL, target SDK 36, min SDK 24.
./gradlew :app:assembleDebug # debug build, installs next to the store version
./gradlew :app:testDebugUnitTest # game-logic unit tests
./gradlew :app:lintDebug # lint, warnings are errors
./gradlew checkKeystore # verify the signing keystore configuration
scripts/verify-release.sh # signed release APK + AAB with pre-upload checks
Signing and the Play Store checklist are in docs/RELEASE.md. Signing material
never lives in this repository. The privacy policy
is published from the sromku.github.io site repository.
The originals live in art/original. Every bitmap under app/src/main/res, the launcher icon and
the Play Store icon (art/store) are generated from them by a Gradle task: a Real-ESRGAN pass (the
anime model, which suits this flat cartoon style) upscales each original 4x, then each asset is
rendered at the exact pixel size it is shown at for every density bucket, phones and tablets
separately, and saved as WebP. Edit or add an original, rerun, commit the result.
brew install webp
# download realesrgan-ncnn-vulkan for macOS from https://github.com/xinntao/Real-ESRGAN/releases
./gradlew regenerateArt -Prealesrgan=/path/to/realesrgan-ncnn-vulkan
The Play listing declares the game for children and certifies COPPA and GDPR compliance. Any change
must keep it free of data collection, network access, permissions, ads, purchases and third-party
SDKs; CLAUDE.md spells this out and the checkChildSafety task fails the build when it can tell.
game/pure Kotlin rules:Difficulty,Board(shuffled pairs),GameEngine(flip state machine),GameResult(stars and score)data/GamePreferencesbest stars and times, key-compatible with the 2019 releaseui/GameViewModelthe round in progress, its clock, and the timing of every effectui/...one fragment per screen, the board and tile views, the popupsaudio/SoundPlayersound effects throughSoundPool
- Code: Apache License 2.0
- Artwork is licensed separately from its authors: