Mobile Match-3 Game Development
Match-3 is a casual genre with serious engineering underneath. Behind "simple" swaps hide cascade mechanics, match detection algorithms, deadlock-free generation, and finely tuned monetization. Poor implementation of any layer kills retention.
Board algorithm: details that matter
Match detection isn't just "find 3 identical in row." Must handle T-shaped and L-shaped patterns, prioritize them over simple triples, assign correct bonus tiles for each shape. Implementation: first mark all matches with bitmask, then iterate marks and determine shape through horizontal/vertical chain intersection analysis.
Gravity and cascades: after removing tiles, fall top to bottom, fill from spawners. Use coroutine-based sequence: first removal animation (150ms), then fall (200ms), then check for new matches—repeat until stable state. Doing it all in one frame without animations makes game feel "dead."
Deadlock detection: after each move, check if any valid swap exists. If none, refresh board with shuffle. Check algorithm: iterate all possible swaps (O(n) where n is cell count) and verify match presence. For 9×9 board—144 possible swaps, check in <0.1ms.
Monetization: move for ad
Classic Match-3: +5 moves for rewarded video. Show offer only when player spent last move and close to victory (remaining quest objects <20% of initial). This logic increases conversion to video view 3–4x vs showing on every loss.
"Close to victory" logic requires real-time analytics layer—quest completion counters must be available at turn end before animation finish.
Timeline: Match-3 with 60 levels, two quest types, monetization—3–5 months.