Students submit code and receive instant verdicts. Teachers track attempts and results in a clear dashboard. Problem statements are available in English, Spanish, and Russian. There's no need to configure workers to testing/run participants' solutions, as with the VPL (Virtual Programming Lab) and CodeRunner plugins. 

If you've ever wanted TopCoder, LeetCode, or Codeforces in Moodle, this plugin is for you!

Demo

• Try it here: https://bacs.sybon.org/

Key features

• Instant auto-judging — per-test verdicts with execution time and memory; pretest input/output visible to students

• Live real-time monitor — the standings update as solutions are judged, no page reloads

• Analytics — a leader "race" chart, task-activity dynamics, score graphs, and a difficulty analysis that predicts how many students can actually solve each task.

• Clear attempts history and grading for teachers

• Works for practice lessons, labs, and contests

• Scales to large cohorts and multiple courses

• External checking via the Sybon service, no extra server setup

• 400+ problems with multilingual statements: EN, ES, RU

Compatibility

• Supported Moodle versions: 3.11 to 5.2

Starter course archives

• Download: EN archive · ES archive · RU archive
• Restore via Course administration → Restore.

Installation

1. Copy the module code to moodleroot/mod/bacs.

2. Go to http://your-moodle/admin (Site administration → Notifications) to start installation.

3. Replace NoDefaultKey with your Sybon API key to access task collections. Configure other defaults if needed.

4. Configure scheduled tasks at /admin/tool/task/scheduledtasks.php to sync available languages, tasks, and solution checks.
   By default, submissions are sent for judging and results are fetched every minute.

5. Add cronjob * * * * * /usr/bin/flock -n /var/lock/moodle-adhoc.lock /usr/bin/php <MOODLE_SITE_DIR>/admin/cli/adhoc_task.php --execute --keep-alive=49 >> <MOODLE_DATA_DIR>/moodle-adhoc.log 2>&1 
   This ensures that submissions receive verdicts as soon as they are sent to Moodle.

6. Add the activity to any course and start using it.

Public key

• You can use a public key with a limit of 20 submissions per minute: YWhwwXtyF0edYR5mWrvQvQ.

Details

• Supported languages: C (C11), C++11, C++17, C++20, C# (.NET 8.0, Mono), Free Pascal, Python 2, Python 3, Java 11, Java 17, Kotlin, Go, Ruby, JavaScript (Node.js), TypeScript (Bun), Rust

• Submissions include execution time and memory for all tests, plus input and output for pretests (visible to participants)

• Contest scoreboard summarizing results across all tasks and participants

• Time windows for contests, upsolving, and practice

• Multiple scoring systems: IOI, ICPC, General

• Per-task scoring and the ability to change the scoring system, task set, task order, and scores at any time, even during or after a contest

• Group support for student cohorts

• Virtual contests so each student can participate at an independent time

• Tools to rejudge, recalculate points, reject, or update submission results

Contact
We are open to collaboration: istupo@gmail.com

Video tutorial