Logic Puzzle / Mobile
built through systems & delivery.
Solo Unity Developer / Personal Project / 2025 - Present
A relaxing Unity logic puzzle game where players divide numbered grids into exact rectangular regions, supported by daily challenges, global leaderboards, cloud saving, and mobile-first polish.
Turned a classic Japanese grid puzzle into a polished mobile brain-training product with retention systems, competitive rankings, and robust cloud sync.
2025 - Present
Solo Unity Developer
Personal Project
FirebasePlayerSync cloud saves for progress, lives, hints, settings, and leaderboard identity
Case study overview
Built the Shikaku puzzle loop around rectangular region selection, numerical area validation, handcrafted levels, and a daily puzzle system.
Implemented Firebase-backed cloud saves, global daily and per-level leaderboards, anonymous or linked auth, and a case-insensitive player-name claiming flow.
Integrated Unity Ads with retry backoff, rewarded callbacks for lives or hints, optimized touch input, DOTween cleanup, and event-driven gameplay state management.
Responsibilities
Core Shikaku puzzle mechanics, mobile interaction model, level flow, and daily puzzle experience
Firebase Realtime Database structure for player progress, daily puzzles, leaderboards, and display-name uniqueness
Unity Ads lifecycle, rewarded flow, DOTween animation cleanup, and RG_EventSystem-driven architecture
Technical work
FirebasePlayerSync cloud saves for progress, lives, hints, settings, and leaderboard identity
TrustedTimeService validation to protect daily puzzle rotation and leaderboard fairness
DPI-relative touch thresholds, multi-touch race-condition fixes, and event-driven systems that reduced Update polling
Challenges
Keeping rectangle selection precise and responsive across devices with different screen densities
Preventing local-time manipulation from unlocking future daily puzzles or affecting leaderboard integrity
Balancing monetization, rewarded hints, leaderboard reads, cloud saves, and animation polish without hurting puzzle flow
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