Every prospective client asks us two questions: "How much will it cost?" and "How long will it take?" We covered costs in our mobile game development cost guide. Now let us tackle timelines with the same honesty.
The short answer: a simple hyper-casual game takes 1-3 months. A complex multiplayer game takes 12-24+ months. But those numbers mean very little without understanding what happens during each phase and what causes projects to take longer than planned.
This guide breaks down realistic timelines by game type, explains the four development phases, identifies the most common causes of delays, and gives you practical strategies for keeping your project on track. Every timeline cited here comes from our direct experience shipping games across the full complexity spectrum.
Timelines by Game Type
Hyper-Casual Games: 1-3 Months
Hyper-casual games are the fastest to develop because they are intentionally simple: one core mechanic, minimal art, short play sessions.
When we developed What's That, the total development timeline was approximately two months with a team of two. This included game design, development, basic art, monetisation integration, and store submission. The project also served as a testbed for our reusable game framework, which now lets us kickstart similar projects 30-50% faster.
Typical breakdown:
- Pre-production: 1-2 weeks
- Core development: 3-6 weeks
- Polish and QA: 1-2 weeks
- Store submission: 1-2 weeks
Casual and Educational Games: 3-6 Months
Casual games, puzzle games, and educational titles require more content, more polished art, and usually some form of progression system or backend integration.
Our partnership with The Language Conservancy on Vocab Builder took approximately six months. We designed and developed nine individual mini-games, built a scalable data pipeline for adding new languages, and handled full store deployment. The timeline was driven primarily by the volume of distinct game modes and the collaborative design process with the client's linguistic experts.
Our founder's team delivered Word Fun World for Cambridge University Press in roughly four months - a mobile game with multiple mini-games designed for early-years language learning. The relatively brisk timeline was possible because Unity's rapid prototyping capabilities allowed the team to realise the client's vision quickly.
Typical breakdown:
- Pre-production: 2-4 weeks
- Core development: 8-16 weeks
- Content creation: 4-8 weeks (often parallel with development)
- QA and polish: 2-4 weeks
- Store submission and launch: 1-2 weeks
Mid-Core Games: 6-12 Months
Strategy games, RPGs, and games with complex systems (AI, procedural generation, economies) fall into this bracket. These projects require deeper technical architecture and significantly more content.
Empires Rise, our internal 4X turn-based strategy game, was developed over approximately six months with a lean team. But this was an internal project where we controlled every decision without client review cycles. A comparable client project - with stakeholder approvals, art revisions, and more extensive QA - would realistically take 8-12 months.
The technical challenges at this tier are substantial. Empires Rise required procedural map generation using modified Perlin Noise with cellular automata, a utility-based AI system with coroutine time-slicing to keep the UI responsive on mobile, and a modular architecture designed for future cross-platform deployment. Each of these systems required prototyping, iteration, and optimisation cycles that add weeks to the timeline.
Typical breakdown:
- Pre-production: 4-8 weeks
- Core systems development: 12-24 weeks
- Content and level design: 8-16 weeks (parallel)
- AI and backend systems: 4-12 weeks (parallel)
- QA, optimisation, and polish: 4-8 weeks
- Store submission and launch: 2-4 weeks
Multiplayer and MMO Games: 12-36+ Months
Multiplayer games are in a category of their own when it comes to timeline. The networking layer alone can take as long as a complete single-player game to develop, and the testing and infrastructure requirements are far more demanding.
Our work on Domi Online - a full-scale MMORPG - has been in active development since 2021 and remains ongoing. The initial vertical slice took approximately 18 months of focused development with a core team of three full-stack developers. That vertical slice included a custom 64-bit progression system, server-authoritative networking with FishNet, cost-optimised AWS infrastructure, and GPU-instanced environments.
During our founder's tenure at Jagex, the RuneScape Mobile port involved a team of 50+ people working for approximately two years. The complexity of bringing a 20-year-old MMORPG with thousands of quests, items, and systems to mobile required rewrites of core gameplay loops, adaptive UI architecture, and extensive cross-platform testing.
Key Takeaway: Multiplayer adds 50-100% to the development timeline compared to a similar single-player game. The networking layer, server infrastructure, security, and testing requirements are substantial. Plan accordingly and do not let anyone tell you multiplayer "only adds a few weeks."
Typical breakdown:
- Pre-production and architecture: 8-16 weeks
- Core systems and networking: 16-40 weeks
- Content and world building: 16-40+ weeks (parallel)
- Server infrastructure and DevOps: 8-16 weeks (parallel)
- Alpha testing and iteration: 8-16 weeks
- Beta testing and optimisation: 8-16 weeks
- Launch preparation: 4-8 weeks
The Four Phases of Game Development
Every game project, regardless of scale, moves through four distinct phases. Understanding these phases helps you set realistic expectations and identify where your project currently sits.
Phase 1: Pre-Production (10-15% of total timeline)
Pre-production is the most important phase and the one most commonly rushed or skipped. This is where you:
- Define the core gameplay loop and mechanics
- Create or refine the Game Design Document (GDD)
- Conduct market research and audience analysis
- Build "greybox" prototypes to test whether the core mechanic is fun
- Define the technical architecture and choose tools/frameworks
- Establish art style guides and asset pipelines
We cannot overstate how much time a thorough pre-production phase saves downstream. Projects that skip this phase invariably spend more time in production because fundamental design questions surface after systems have already been built. Our game design services exist specifically to help clients get this phase right.
Phase 2: Production (50-60% of total timeline)
Production is the longest phase. This is where the game is actually built:
- Programming core systems and gameplay
- Creating art assets, animations, and visual effects
- Composing music and designing sound effects
- Building levels and content
- Integrating backend services (analytics, monetisation, cloud saves)
- Regular milestone reviews and playtest sessions
We work in two-week sprint cycles during production, delivering playable builds at each milestone so clients can see tangible progress and provide feedback before too much work is invested in any single direction.
Phase 3: QA and Polish (15-20% of total timeline)
Quality assurance is not something that happens at the end - it should be integrated throughout production. But the final QA phase focuses on:
- Comprehensive functional testing across all supported devices
- Performance profiling and optimisation on target hardware
- Bug fixing and regression testing
- Accessibility improvements
- Final art and animation polish
- Platform compliance verification
This phase is frequently underestimated. We routinely see projects that allocate just one week for QA on a six-month game, which is a recipe for a buggy launch and negative reviews.
Phase 4: Launch and Post-Launch (10-15% of total timeline)
The work does not stop when the game is "done":
- App Store and Google Play submission (which can involve multiple review rounds)
- App Store Optimisation (ASO) for discoverability
- Launch monitoring (crash rates, performance metrics, user feedback)
- Day-one patches for issues discovered by the broader player base
- Analytics review and initial live operations
The 6 Most Common Causes of Delays
Over more than a decade of game development, we have seen the same delay patterns repeat across projects of all sizes. Here are the six most common causes and how to mitigate them.
1. Undefined or Changing Scope
The single biggest cause of delays. When the scope is not locked down before production begins, new features and changes get added continuously. Each "small addition" extends the timeline by days or weeks, and the cumulative effect can double a project's duration.
Mitigation: Invest in pre-production. Create a detailed GDD with a prioritised feature list. Agree on a clear "MVP" (Minimum Viable Product) scope and treat everything else as post-launch content.
2. Art and Asset Dependencies
Programming often moves faster than art production, creating bottlenecks where engineers are waiting for assets. Conversely, art changes requested late in production can force engineering rework.
Mitigation: Establish the art pipeline early. Use placeholder ("greybox") assets during development so engineering work is never blocked. Lock down the art style before production begins.
3. Multiplayer and Networking Complexity
Networking bugs are among the hardest to reproduce and fix. Race conditions, desynchronisation, and latency-related issues often only surface under specific conditions that are difficult to simulate in a development environment.
Mitigation: Budget extra time for multiplayer testing. Build automated stress-testing tools early. Accept that networking will take longer than you think, even if your team is experienced.
4. Platform-Specific Issues
A game that works perfectly on one device may crash on another due to GPU driver differences, OS version incompatibilities, or screen aspect ratio variations. Mobile fragmentation - particularly on Android - creates a long tail of device-specific bugs.
Mitigation: Begin device testing early and on real hardware, not just emulators. Define a target device matrix at the start of the project and test against it regularly.
5. Store Submission Rejections
Both Apple and Google reject apps for policy violations, and the review process can take days to weeks per submission. Common rejection reasons include privacy policy issues, monetisation guideline violations, and performance problems on low-end devices.
Mitigation: Review platform guidelines before development begins. Build compliance checks into your QA process. Budget 2-4 weeks for the submission cycle, not just a few days.
6. Stakeholder Feedback Cycles
Client review and approval cycles can introduce significant delays if not managed proactively. A two-week delay in feedback on a milestone can push the entire project back by a month once downstream dependencies are accounted for.
Mitigation: Establish clear review windows in the project schedule. Agree on maximum feedback turnaround times (we recommend 3-5 business days per milestone). Use regular sprint reviews to keep stakeholders engaged throughout development.
Key Takeaway: Most delays are caused by process problems, not technical problems. Clear scope definition, established art pipelines, and structured feedback cycles prevent the majority of schedule overruns. Invest time in these processes upfront and you will save far more time downstream.
How to Plan a Realistic Timeline
Based on our experience, here is a practical framework for planning your game development timeline.
Step 1: Classify Your Project
Use the game type categories above to establish a baseline timeline range. Be honest about where your project falls - ambition is good, but underestimating complexity leads to missed deadlines.
Step 2: Add Contingency
Apply a contingency buffer of 20-30% to your baseline timeline. This is not pessimism; it is standard practice in professional game development. Platform changes, unexpected bugs, and scope refinements will consume this buffer.
Step 3: Work Backwards from Your Launch Date
If you have a fixed launch date (a conference, a seasonal window, a contractual obligation), work backwards to determine when development must start. If the math does not work, you have three options:
- Reduce scope
- Increase team size
- Move the launch date
We have found that option 1 (reducing scope) produces the best outcomes. Smaller, polished games outperform ambitious, unfinished ones every time.
Step 4: Use a Timeline Estimator
We have built a free Game Development Timeline Estimator that lets you input your project parameters and receive an indicative timeline range. It accounts for game type, team size, platform targets, and multiplayer requirements.
Step 5: Milestone, Do Not Waterfall
Break your project into milestones of 2-4 weeks each, with a playable deliverable at each milestone. This gives you regular checkpoints to assess progress, catch scope creep early, and adjust the plan if something takes longer than expected.
A Note on Team Size and Timeline
There is a common misconception that doubling your team halves your timeline. In practice, the relationship between team size and development speed follows a curve of diminishing returns.
- 1-2 developers: Ideal for hyper-casual and simple casual games. Low communication overhead, fast decision-making.
- 3-5 developers: The sweet spot for most mid-core projects. Enough specialisation to cover programming, art, and design without excessive coordination costs.
- 6-10 developers: Necessary for larger projects, but each additional person adds communication overhead. This is where project management becomes critical.
- 10+ developers: Required for AAA-scale projects. The overhead of coordination, code integration, and pipeline management becomes a significant percentage of total effort.
We delivered the Domi Online vertical slice with a core team of just three full-stack developers, proving that efficient architecture beats brute-force headcount. A larger team would have been faster in some areas but would have introduced coordination overhead that could have offset the gains.
The Bottom Line
Game development timelines range from 1 month for the simplest titles to 3+ years for ambitious multiplayer experiences. The biggest determinant is game type, but scope clarity, team size, and process discipline have an equally significant impact on whether your project finishes on time.
The single best thing you can do to protect your timeline is to invest properly in pre-production. Define your scope. Build prototypes. Lock down your art pipeline. Then execute with structured milestones and regular stakeholder reviews.
We have shipped games across every timeline bracket discussed in this article, and we are always happy to review your project plan and give you an honest assessment of whether your timeline is realistic.
