Design
Memory Matching Card Game
Design a memory card-matching game where players flip pairs of cards trying to find matches.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
It's a compact way to test explicit state-machine thinking for user interaction flows (flip → check → resolve) rather than ad-hoc flags scattered through the UI logic.
02 - Where this system exists in the real world
You interact with this design every day.
Mobile memory/concentration card games
Educational matching games for kids
Multiplayer party game platforms
03 - What you'll master
Solve this once. Know it forever.
Model a flip-check-resolve interaction as states
Implement fair shuffling algorithms
Support turn-based multiplayer scoring
04 - What you'll design
6 functional · 2 non-functional requirements.
Generate a shuffled board of N pairs of cards (face down)
5 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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