Roblox LeetCode Questions and How Roblox Interviews Work

The 56 problems LeetCode tags for Roblox, grouped by pattern, plus how Roblox's assessments and coding rounds work and what to practice first.

Roblox does not publish a question bank. The closest public evidence for Roblox LeetCode questions is LeetCode's Roblox company tag, which two GitHub repositories mirror: 56 problems, 8 easy, 35 medium and 13 hard. Candy Crush and Reorganize String top both lists, with Text Justification, Task Scheduler, Maximize Distance to Closest Person and Course Schedule II close behind. Most of the list falls into five patterns: grid simulation, string formatting, scheduling, small "design a class" problems and sliding windows. The list is only half the picture, though. Early career applicants start with Roblox's own game-based assessments, which Roblox describes as their first interview. For experienced engineers, interviewing.io's guide says Roblox coding questions are LeetCode medium in difficulty but not necessarily LeetCode-style, and are placed in a situational context relevant to the work.

Where the list comes from, and how far to trust it

Two community repositories mirror LeetCode's company tags: snehasishroy/leetcode-companywise-interview-questions, whose README dates its snapshot to 12 July 2026, and liquidslr/leetcode-company-wise-problems, whose README dates its lists to June 2025. The two snapshots are about a year apart and carry the same 56 Roblox problems, so the full list has barely changed.

Three things in the data should shape how you use it:

• The recent sample is thin. In the July 2026 snapshot, the three-month list for Roblox has three problems: Candy Crush, Design Hit Counter and Maximize Distance to Closest Person. The six-month list adds Logger Rate Limiter, Design Search Autocomplete System and Number of Ways to Wear Different Hats to Each Other. The other 50 appear only in the list of problems reported more than six months ago. Treat the tag as a map of patterns, not a forecast of your exact question.
• Several top problems are Premium-only on LeetCode. Candy Crush, Design Hit Counter, Logger Rate Limiter, Employee Free Time, Design Search Autocomplete System and Brightest Position on Street are all locked. If you do not pay for Premium, the free problems in the same pattern (listed below) cover the same skills.
• Two of the 56 are SQL problems (Students and Examinations, Number of Trusted Contacts of a Customer). If you are applying for a data role, do not skip them.

The tag also lines up with what interviewing.io describes. interviewing.io, which says its Roblox guide is based on conversations with Roblox engineers, lists the topics as hash maps, matrices, search, parsing, arrays, dynamic programming, strings, graphs and sorting. That is close to the shape of the tag.

The tagged problems, grouped by what they test

• Pattern — Tagged problems (P = Premium) — What a Roblox-style version might look like
• Grid and board simulation — Candy Crush (P), Rotate Image, Rotating the Box, Spiral Matrix, Rotting Oranges, Image Smoother, Number of Black Blocks — Resolve matches on a puzzle board, apply gravity to blocks, spread an effect across a map
• String formatting and parsing — Text Justification, Integer to English Words, Reorganize String, Basic Calculator IV, Subdomain Visit Count, Valid Parentheses, Longest Common Prefix — Lay out chat text in a fixed-width box, parse a command, count visits per domain from logs
• Scheduling, intervals and ordering — Task Scheduler, Merge Intervals, Employee Free Time (P), Number of Flowers in Full Bloom, Brightest Position on Street (P), Course Schedule, Course Schedule II — Order asset loading by dependency, merge overlapping play sessions, find free time across a team
• Design a small class around a stream — Design Hit Counter (P), Logger Rate Limiter (P), Number of Recent Calls, Design Browser History, Insert Delete GetRandom O(1), Design Memory Allocator, Implement Trie, Design Search Autocomplete System (P) — Throttle repeated chat messages, count players active in the last five minutes, autocomplete a search box
• Arrays, hashing and sliding windows — Two Sum, Maximize Distance to Closest Person, Longest Substring Without Repeating Characters, Longest Consecutive Sequence, Subarrays with K Different Integers, Count Number of Nice Subarrays, Sliding Window Maximum — Pick the seat farthest from other players, find the longest streak in a stream of events

The right-hand column is our own reframing, not a list of reported Roblox questions. It is there because interviewing.io's guide says Roblox coding questions are LeetCode medium in difficulty but "won't necessarily be LeetCode-style": they tend to sit inside a situational context tied to the work. Practicing that translation is the useful part. When you finish a tagged problem, restate it as a game feature in one sentence, then ask yourself which constraint the scenario adds (many players at once, a real-time limit, a moderation rule) and how your solution changes.

Two hard problems stand apart: Number of Ways to Wear Different Hats to Each Other (bitmask dynamic programming) and Block Placement Queries (segment tree or ordered set). They are a poor use of the first week of prep, so cover the five patterns first. If you have time left, try the hats problem before the other hard ones, since it is one of the six in the recent list.

A worked example: Candy Crush

Candy Crush has the top frequency score in both mirrors and is in the recent three-month list, and it shows what "clean code" means on a simulation problem. You get a grid of integers, where each value is a candy type and 0 is empty. Any horizontal or vertical run of three or more equal candies is crushed, all at the same time. Candies above the gaps then fall down, and you repeat until the board is stable.

A strong answer keeps three phases separate: find every cell to crush, crush them together, then drop. Marking first matters because one cell can belong to a horizontal and a vertical run at once; if you clear cells while you scan, you miss the second run.

def candy_crush(board):
    rows, cols = len(board), len(board[0])
    while True:
        crush = set()
        # 1. Mark every cell in a horizontal or vertical run of 3+
        for r in range(rows):
            for c in range(cols - 2):
                v = board[r][c]
                if v and v == board[r][c + 1] == board[r][c + 2]:
                    crush |= {(r, c), (r, c + 1), (r, c + 2)}
        for r in range(rows - 2):
            for c in range(cols):
                v = board[r][c]
                if v and v == board[r + 1][c] == board[r + 2][c]:
                    crush |= {(r, c), (r + 1, c), (r + 2, c)}
        if not crush:
            return board
        # 2. Crush them all at once
        for r, c in crush:
            board[r][c] = 0
        # 3. Drop: compact each column toward the bottom
        for c in range(cols):
            write = rows - 1
            for r in range(rows - 1, -1, -1):
                if board[r][c]:
                    board[write][c] = board[r][c]
                    write -= 1
            for r in range(write, -1, -1):
                board[r][c] = 0

Each pass is linear in the number of cells. Every pass that continues crushes at least three cells, so there are at most about cells / 3 passes, and the worst case is quadratic in the board size. The drop step is a two-pointer compaction per column, which is the same idea as Rotating the Box, a free problem on the tag.

What separates a good answer here is less the algorithm than the finish. interviewing.io's guide says Roblox wants you to write clean code, run test cases and compile the code, not just reach a solution. So name the three phases out loud, then test before you say you are done: a board with no matches, a cell that sits in both a row and a column match, a column that empties completely, and a crush that triggers a second cascade.

What the actual Roblox rounds look like

The path depends on whether you are applying as early career or experienced.

Interns and new grads start with Roblox's own assessments. Roblox's early career page calls the assessment "your first interview". It includes game-based problem-solving tasks built on Roblox, a set of workplace decision-making scenarios, and, for technical applicants, a coding evaluation "entirely unique to Roblox" alongside an algorithmic reasoning assessment. You can take them in one sitting or spread them over a week, extensions can be requested, and Roblox says you will hear back within a few weeks. Two untimed practice games mirror the real ones: Kaiju Cats for the Robots and Factories problem-solving task, and Coding Cookies for the block-coding interface in Outpost: Mars. Roblox also points candidates to Speak_, a prep platform that Roblox says offers courses covering its virtual onsite interview stages; Speak_'s Roblox page splits preparation into an assessments level and an interviews level.

The practical point: LeetCode practice does not prepare you for a game-based problem-solving task. Play both practice games before you start the real assessments.

Experienced engineers get a team-led loop. interviewing.io describes this process for mid-level and senior engineers, and notes that it is decentralized, so managers adjust the stages for their roles:

• Stage — Length — What interviewing.io reports
• Recruiter call — 30 minutes — Background, why Roblox, what you want next
• Technical phone screen — 60 to 90 minutes — Usually a coding round in CodeSignal; some senior roles get system design instead
• Onsite (can be split over a week or two) — 4 to 7 hours — 2 coding rounds in CodeSignal, 1 to 2 system design rounds, 1 to 3 behavioral rounds
• Bar raiser — 1 hour — A technical problem that is not a coding exercise, designed to take you out of your comfort zone

The same guide puts the whole process at about six to eight weeks, says system design can be a standard prompt such as building Minesweeper or a deep dive into a system you built, and describes the behavioral rounds as potentially including an engineering manager, a director and a VP. It gives one example of the bar raiser problem: people finding ways around Roblox's moderation system to post inappropriate content. It also states that AI use in Roblox interviews is strictly prohibited.

What to do this week

1. Early career: play Kaiju Cats and Coding Cookies, then sign up for Speak_ from the Roblox early career page. Do this before LeetCode, because the assessments come first.
2. Work the five patterns in order of payoff: grid simulation, design-a-class, scheduling and intervals, strings, then sliding windows. Two or three problems per pattern is enough to start. Use the free substitutes if you skip Premium: Rotating the Box for Candy Crush, Number of Recent Calls for Design Hit Counter and Logger Rate Limiter, Merge Intervals for Employee Free Time.
3. Practice in a plain editor with your own tests. The coding rounds interviewing.io describes run in CodeSignal, and the guide stresses running test cases. Get used to writing three or four test inputs before anyone asks.
4. Reframe every problem as a game feature in one sentence, as in the table above. If an interviewer wraps a problem in a scenario, you will recognize the pattern underneath.
5. Prepare two stories for the behavioral and VP rounds: the project you are proudest of, and a hard technical call you made. Be ready to justify anything on your resume. Our STAR interview questions guide has a structure for both.

If you want to rehearse explaining a solution out loud before the real rounds, Verve AI's AI mock interview has a Software Engineering question bank and a Custom Questions option, where an AI recruiter asks the questions you saved (the tagged problems above, for example) and gives you a scored report afterwards. For broader coding prep, see our 30 LeetCode interview questions and the technical round interview questions guide.

FAQ

Are Roblox coding questions LeetCode hard? Mostly not. The tag is weighted to medium (35 of 56), and interviewing.io's guide describes the coding rounds as LeetCode medium in difficulty, framed in a work-related scenario.

Does Roblox use HackerRank or CodeSignal? For experienced hires, interviewing.io reports CodeSignal for the phone screen and onsite coding rounds. Early career applicants take a coding evaluation that Roblox describes as unique to Roblox.

Can I use AI tools during a Roblox interview? interviewing.io states that AI use in Roblox interviews is strictly prohibited. Check what your recruiter tells you for your specific loop.

Sources

• Roblox early career assessments (game-based tasks, decision making, coding evaluation, pacing over a week, extensions, response time, Kaiju Cats, Coding Cookies, Robots and Factories, Outpost: Mars, Speak_): https://careers.roblox.com/early-career
• Speak_ Roblox prep page (assessment and interview levels, Kaiju Cats as practice for the problem-solving assessments, Coding Cookies for Outpost: Mars): https://speak.careers/roblox-go
• Experienced-hire process, stage lengths, CodeSignal, onsite mix, bar raiser and moderation example, six to eight weeks, LeetCode-medium difficulty, clean code and test cases, topic list, AI prohibition: https://interviewing.io/roblox-interview-questions
• Roblox LeetCode tag mirror, snapshot dated 12 July 2026 (56 problems, difficulty split, top problems by frequency, SQL problems): https://github.com/snehasishroy/leetcode-companywise-interview-questions/blob/master/roblox/all.csv
• Same mirror, three-month and six-month Roblox lists: https://github.com/snehasishroy/leetcode-companywise-interview-questions/blob/master/roblox/three-months.csv , https://github.com/snehasishroy/leetcode-companywise-interview-questions/blob/master/roblox/six-months.csv
• Snapshot date of that mirror (README): https://github.com/snehasishroy/leetcode-companywise-interview-questions
• Older mirror, lists dated June 2025 in its README (same 56 problems, Candy Crush first): https://github.com/liquidslr/leetcode-company-wise-problems/tree/main/Roblox , https://github.com/liquidslr/leetcode-company-wise-problems
• Premium-only status: https://leetcode.com/problems/candy-crush/ , https://leetcode.com/problems/design-hit-counter/ , https://leetcode.com/problems/logger-rate-limiter/ , https://leetcode.com/problems/employee-free-time/ , https://leetcode.com/problems/design-search-autocomplete-system/ , https://leetcode.com/problems/brightest-position-on-street/
• Free substitute problems: https://leetcode.com/problems/rotating-the-box/ , https://leetcode.com/problems/number-of-recent-calls/ , https://leetcode.com/problems/merge-intervals/
• Verve AI Mock Interview (Software Engineering and Custom Questions banks, AI recruiter, scored report): https://docs.vervecopilot.com/features/mock-interview