Docs & help
Practical, detailed guides to every user-facing part of Katabench. Start with the first solve, or jump directly to the feature you need. Can't find an answer? Email support@katabench.com.
Start here
Practice
Using the puzzle playground
7 min readA detailed tour of the catalog, problem brief, hints, editor, custom inputs, results, reference solutions, and mobile workspace.
The editor & runtime
6 min readHow code is shaped on the platform: the Solution class, the C# version and libraries you can use, keyboard shortcuts, and autosave.
How grading works
6 min readTime budgets, allocation tracking, hidden tests, and what each result status means.
Tracks and System Design
6 min readWhat the seven code tracks train, how each one grades you, and what the visual System Design Studio adds.
Writing fast C#
4 min readA practical guide to passing the time and allocation gates: pick the right complexity first, then cut the garbage your code leaves behind.
Database track: LINQ, SQL, and query plans
7 min readHow Database / EF puzzles run against a real PostgreSQL database, what the SQL log and query-plan panel show, and how plan rules are graded.
Test Writing track: catching planted bugs
5 min readHow Test Writing puzzles flip the format: you write the tests, the grader runs them against a correct implementation and against planted-bug mutants.
Using the System Design Studio
7 min readHow to build, check, and submit an architecture in the System Design Studio: the palette, canvas, rules, capacity report, reveal, drafts, and free challenges.
Keyboard shortcuts & workspace tips
6 min readEvery keyboard shortcut in the Playground, Labs, and System Design Studio, the editor's built-in commands, and how to resize and navigate the workspace.
Guided learning
Following learning paths
4 min readHow to choose, preview, start, continue, and complete a curated puzzle curriculum while keeping open practice available.
Working through Katabench Labs
6 min readHow courses, Labs, lessons, temporary workspaces, guides, terminals, checks, progress, and session recovery fit together.
Progress
Account & help
Plans, limits & billing
5 min readWhat the Free plan includes, what Pro unlocks, what counts against your daily quota, and how billing and refunds work.
Troubleshooting
7 min readFix common problems with Run, Submit, compilation, timeouts, results, saved code, quotas, learning paths, Labs, and billing.
Frequently asked questions
6 min readQuick answers to the questions people ask most: what the platform is, how grading works, what's free, and how your code and data are handled.