If you want to build your first mobile game, start with a small playable prototype, not a long feature list or a large asset budget. Choose one core action, a target platform, and an engine you can export with. Then test the game loop on a phone before expanding the project.
1. Define the smallest playable version
Write a one-page brief before choosing tools:
- Player and device: Who is the game for, and will you support Android, iOS, or both?
- Core loop: What does the player do, what feedback do they get, and what makes them want to try again?
- First milestone: What is the smallest level or round that demonstrates this loop?
- Limits: How much time can you spend, and which features can wait until after people try the prototype?
Start with one mechanic and temporary art. A single puzzle, short platforming level, or simple arcade round is easier to finish and evaluate than a multiplayer game with several modes. A mobile game design checklist can help you think through the experience, but treat it as prompts rather than a formula for success.
2. Choose an engine you can ship with
Two practical starting points for a solo developer or small team are:
| Engine | Consider it when | Check before committing |
|---|---|---|
| Godot | You want an open-source engine with a capable 2D workflow and options for 3D. | Review the MIT license and its notice requirements. The Android export guide and iOS export guide explain platform setup. |
| Unity | You prefer a C# workflow or want its broad 2D/3D tooling and ecosystem. | Unity Personal has financial eligibility requirements. The current terms state a US$200,000 threshold over the most recent 12 months; verify the live terms before choosing a plan. Check the Android and iOS build requirements too. |
You do not need to compare every engine before starting. Pick one that supports your target devices, fits your programming experience, and has a build path you can use. If you are undecided, make the same tiny prototype in each shortlisted engine, then continue with the one that is easier for you to change and export.
3. Build a prototype and export it early
Use temporary shapes and sounds while you build the core interaction. Set up touch controls and check that menus and text fit different screen sizes; do not assume a desktop preview shows how the game will feel on a phone.
Install only the platform tools you need, and follow the engine's current export instructions. For example, Godot's Android workflow uses OpenJDK 17 and the Android SDK. Godot exports an iOS project for Xcode; Unity's iOS workflow requires its iOS Build Support module and Xcode, or Unity Build Automation. A local iOS build therefore needs access to Apple's Xcode toolchain. These requirements can change, so use the linked engine documentation rather than an old setup checklist.
Keep a copy of each asset's license and source as you add it. You can find starting points in our guides to free game sound effects and CC0 game assets; check the terms for each asset you actually use.
4. Test on real devices before polishing
Make a build you can install, then check the parts most likely to fail on a phone:
- Can a new player understand the controls without a keyboard or mouse?
- Do buttons, text, and important play areas remain usable on different screen sizes and around display cutouts?
- Does the game behave correctly when a call, notification, app switch, or screen lock interrupts play?
- Is the game responsive on the older or lower-powered device you intend to support?
- Do sound, pause, restart, and save behavior work as expected?
Keep a short, repeatable checklist and record what device and build you used. This introduction to writing test cases can help make checks easier to repeat. If external testing fits your budget, review the scope of a game testing service; it is optional, not a substitute for testing the actual devices your audience uses.
For another perspective on player motivations, see our overview of the psychology behind addictive mobile games. Use engagement ideas responsibly: make controls clear and give players meaningful choices rather than designing around pressure to keep playing or spending.
5. Plan for store accounts and release checks
You can prototype and test locally before paying for public store distribution. When you are ready to publish, account for current platform costs and review rules:
- Google Play: Google lists a US$25 one-time developer account registration fee. For personal developer accounts created after November 13, 2023, Google currently requires a closed test with at least 12 testers opted in continuously for 14 days before you can apply for production access. Check the registration and testing requirements for your account.
- Apple App Store: The Apple Developer Program is US$99 per membership year in the United States, with local-currency pricing where available. Use TestFlight to distribute beta builds, and review Apple's App Review Guidelines before preparing a release.
Store requirements, fees, and engine terms can change. Recheck the official pages before budgeting or setting a launch date; passing a review or paying a fee does not guarantee downloads or revenue.
A practical first milestone
Write the one-page brief, build one playable round, and install it on a phone. Ask a few people who resemble your intended players to try it while you observe where they hesitate. Use that feedback to decide whether the core loop is worth expanding before buying assets, adding monetization, or planning a large launch.
If you are still exploring ideas, browse our collection of open-source HTML5 games for examples of small playable projects.