Kotlin Quest

JSO LABS

In-app purchases

About this app

Kotlin Quest turns Kotlin into a daily habit you actually enjoy.
Solve coding challenges by snapping pieces into place, get instant feedback, and progress from programming fundamentals toward practical Android skills—without drowning in theory on day one.

Learn by doing

Drag-and-drop challenges that build real Kotlin structure step by step
Clear validation so you know what works—and what to fix
Optional hints when you want a nudge, not a shortcut

A path that grows with you
Explore themed worlds that stack skills in a sensible order: core concepts, logic and patterns, Kotlin essentials, Android development, and more advanced language features. Complete challenges, earn rewards, and unlock new areas as you improve.

Stay motivated

XP and levels that reflect your progress
Coins you earn by completing challenges
Achievements and streaks to keep consistency fun
Celebrate wins with satisfying feedback as you level up

Free to start, upgrade if you want more
Play for free with a lives system that paces your sessions, earn coins, and unlock worlds over time. Premium removes life limits and waiting, unlocks all worlds immediately, and adds exclusive content—choose what fits your pace.

Whether you’re new to code or sharpening Kotlin for Android, Kotlin Quest helps you practice in short, focused sessions—playful, challenging, and built for real learning.