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56+ Roblox questions

Roblox interview questions and how to prepare

The questions candidates report from Roblox interviews, sorted by how often they come up, with difficulty and topics, plus original practice written in Roblox's interview style.

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ZorixOS tracks 56 community-reported Roblox interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 77 original ZorixOS practice questions written in Roblox's known interview style (not claimed as asked at Roblox), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Roblox.

Updated July 2026

Roblox interview questions candidates report

Community-reported from real Roblox interviews (open-source dataset), most-asked first. Showing 56. Each links to its source.

  1. Candy Crush
    ArrayTwo PointersMatrixSimulation
    Medium100% asked
  2. Logger Rate Limiter
    Hash TableDesignData Stream
    Easy100% asked
  3. Reorganize String
    Hash TableStringGreedySorting
    Medium97% asked
  4. Number of Ways to Wear Different Hats to Each Other
    ArrayDynamic ProgrammingBit ManipulationBitmask
    Hard93% asked
  5. Text Justification
    ArrayStringSimulation
    Hard91% asked
  6. Task Scheduler
    ArrayHash TableGreedySorting
    Medium88% asked
  7. Maximize Distance to Closest Person
    Array
    Medium86% asked
  8. Course Schedule II
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium85% asked
  9. Design Search Autocomplete System
    StringDepth-First SearchDesignTrie
    Hard84% asked
  10. Design Hit Counter
    ArrayBinary SearchDesignQueue
    Medium77% asked
  11. Two Sum
    ArrayHash Table
    Easy74% asked
  12. Integer to English Words
    MathStringRecursion
    Hard74% asked
  13. Rotate Image
    ArrayMathMatrix
    Medium74% asked
  14. Count Number of Nice Subarrays
    ArrayHash TableMathSliding Window
    Medium73% asked
  15. Group the People Given the Group Size They Belong To
    ArrayHash TableGreedy
    Medium73% asked
  16. Convert Binary Number in a Linked List to Integer
    Linked ListMath
    Easy71% asked
  17. Magnetic Force Between Two Balls
    ArrayBinary SearchSorting
    Medium71% asked
  18. Maximum Number of Occurrences of a Substring
    Hash TableStringSliding Window
    Medium71% asked
  19. Number of Trusted Contacts of a Customer
    Database
    Medium71% asked
  20. Students and Examinations
    Database
    Easy71% asked
  21. Subdomain Visit Count
    ArrayHash TableStringCounting
    Medium71% asked
  22. Minimum Operations to Write the Letter Y on a Grid
    ArrayHash TableMatrixCounting
    Medium69% asked
  23. Implement Trie (Prefix Tree)
    Hash TableStringDesignTrie
    Medium66% asked
  24. Minimum Absolute Difference Between Elements With Constraint
    ArrayBinary SearchOrdered Set
    Medium66% asked
  25. Number of Black Blocks
    ArrayHash TableEnumeration
    Medium66% asked
  26. Valid Parentheses
    StringStack
    Easy66% asked
  27. Course Schedule
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium63% asked
  28. Find the Length of the Longest Common Prefix
    ArrayHash TableStringTrie
    Medium61% asked
  29. Block Placement Queries
    ArrayBinary SearchBinary Indexed TreeSegment Tree
    Hard59% asked
  30. Brightest Position on Street
    ArraySortingPrefix SumOrdered Set
    Medium59% asked
  31. Number of Adjacent Elements With the Same Color
    Array
    Medium59% asked
  32. Rotating the Box
    ArrayTwo PointersMatrix
    Medium59% asked
  33. Subarrays with K Different Integers
    ArrayHash TableSliding WindowCounting
    Hard59% asked
  34. Largest Rectangle in Histogram
    ArrayStackMonotonic Stack
    Hard55% asked
  35. Merge Intervals
    ArraySorting
    Medium55% asked
  36. Number of Flowers in Full Bloom
    ArrayHash TableBinary SearchSorting
    Hard55% asked
  37. Spiral Matrix
    ArrayMatrixSimulation
    Medium55% asked
  38. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard55% asked
  39. Number of Recent Calls
    DesignQueueData Stream
    Easy52% asked
  40. Count the Number of Good Subarrays
    ArrayHash TableSliding Window
    Medium49% asked
  41. Design Browser History
    ArrayLinked ListStackDesign
    Medium49% asked
  42. Length of Longest V-Shaped Diagonal Segment
    ArrayDynamic ProgrammingMemoizationMatrix
    Hard49% asked
  43. Longest Common Prefix
    ArrayStringTrie
    Easy49% asked
  44. Basic Calculator IV
    Hash TableMathStringStack
    Hard41% asked
  45. Count Nice Pairs in an Array
    ArrayHash TableMathCounting
    Medium41% asked
  46. Design Memory Allocator
    ArrayHash TableDesignSimulation
    Medium41% asked
  47. Employee Free Time
    ArraySweep LineSortingHeap (Priority Queue)
    Hard41% asked
  48. Image Smoother
    ArrayMatrix
    Easy41% asked
  49. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium41% asked
  50. Longest Consecutive Sequence
    ArrayHash TableUnion-Find
    Medium41% asked
  51. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium41% asked
  52. Minimum Number of Frogs Croaking
    StringCounting
    Medium41% asked
  53. Random Pick with Weight
    ArrayMathBinary SearchPrefix Sum
    Medium41% asked
  54. Restore the Array From Adjacent Pairs
    ArrayHash TableDepth-First Search
    Medium41% asked
  55. Rotting Oranges
    ArrayBreadth-First SearchMatrix
    Medium41% asked
  56. Sliding Window Maximum
    ArrayQueueSliding WindowHeap (Priority Queue)
    Hard41% asked

Practice questions in Roblox's style

Original ZorixOS questions written the way Roblox interviews, so you rehearse the real format. Not claimed as asked at Roblox.

  1. Imagine a user is experiencing lag when loading a complex world with many assets and players. How would you diagnose and address potential performance bottlenecks in the Roblox client's rendering pipeline? Consider issues like asset loading, physics simulation, and network synchronization.

    Software EngineerDebugging & PerformanceTests: Evaluates debugging skills, understanding of distributed systems at scale, and client-side performance optimization.

  2. Roblox hosts millions of concurrent experiences. Design a system to efficiently manage and distribute real-time avatar customizations (e.g., hats, accessories, shirts) across a large number of active users and servers, ensuring low latency and high availability.

    Software EngineerSystem DesignTests: Tests system design capabilities, understanding of distributed systems, caching strategies, and real-time data synchronization.

  3. A common bug reported is that players sometimes get stuck in the environment or fall through the map. Describe how you would approach debugging this issue, considering the physics engine, character controller, and potential race conditions.

    Software EngineerDebuggingTests: Assesses systematic debugging approach, knowledge of physics engines, and concurrency issues.

  4. Given Roblox's massive scale, how would you design a robust and scalable system for detecting and mitigating cheating or exploit attempts within user-created experiences? Focus on real-time detection mechanisms and preventing unauthorized actions.

    Software EngineerSystem DesignTests: Evaluates ability to design secure and scalable systems, understanding of anomaly detection, and real-time threat mitigation.

  5. Describe the data structures and algorithms you might use to optimize the loading of unique user-generated assets (e.g., meshes, textures) within a Roblox world, balancing memory usage and load times. Assume a catalog of millions of unique assets.

    Software EngineerData Structures & AlgorithmsTests: Tests knowledge of efficient data structures and algorithms for managing large asset catalogs and optimizing retrieval.

  6. How would you implement a system for 'undo' functionality in the Roblox Studio editor, allowing creators to revert complex changes to their experiences? Consider the scope of changes (e.g., script modifications, part placements) and potential performance implications.

    Software EngineerCoding & ReasoningTests: Assesses coding logic, understanding of state management, and ability to handle complex operational histories.

71+ more Roblox-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

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Roblox Interview Questions (2026) | ZorixOS