What question types are supported?

Multiple choice, true/false, full coding questions, Parsons drag-to-order puzzles, and whiteboard sketches can be mixed in one quiz.

Can students use AI during a quiz?

Only if you enable it. Hint-only Rena gives conceptual nudges on coding questions and never writes code or full solutions.

Do I have to write every question myself?

No. Auto-generate questions from topics and difficulty, pull from the library, or write your own and edit any of them freely.

Free to start: hosting live classrooms and every question type is included on the free tier. Paid tiers add extras like hint-only Rena for students and AI quiz generation. See the For Educators page for plans.

{A}

https://algoarena.net/classroom/lobby/classroom_intro_cs_demo

Join at algoarena.net/classroom

or enter code

CS2026

Game Settings

Questions

Time

10s to 20m per question

Topics: arrays, linked lists, strings

Waiting for a student to join...

Players

1 joined

NPNoah Parkready

You are the host

https://algoarena.net/classroom

Join a session

Classroom join

Enter the 6-character code from your host, then join the live room.

Classroom

The CS classroom, rebuilt for the AI era.

Host live algorithm quizzes, let students code in the room, and debrief the exact concepts that need attention.

Meet with the team Try a live classroom

Piloted in a Bryn Mawr College CS classroom. Free to start with a generous educator free tier.

Classroom pilot

Piloted in a Bryn Mawr College CS classroom.

Classroom is shaped around an instructor's real loop: start class quickly, see who is stuck, and leave with a useful debrief.

Read host notes

The classroom control gap

Shared visibility matters more than another black box.

Teachers and students are already using AI. Classroom gives the educator a visible role in setting boundaries, seeing progress, and choosing the next explanation.

60%

Teachers are already using AI for work.

Weekly users estimated 5.9 hours saved per week.

Gallup 2025 · 2,232 U.S. public-school teachers

18%

Formal workplace guidance is lagging.

Only 18% reported receiving formal guidance on AI use.

Gallup 2026 · 2,069 U.S. public-school teachers

56%

Students are bringing AI into the room.

Gen Z K–12 students use GenAI weekly. 80% of surveyed Gen Z worry AI may make future learning harder.

Gallup 2026 · 1,572 U.S. people ages 14–29

One live teaching loop

From first join code to the next lesson.

Four focused views show what the educator can control, what the student can ask, and what the class leaves behind.

Live room

Host the whole class from one surface.

Share a short join code, keep everyone on the same question, and watch submissions land without switching dashboards.

Host a classroom

Live question

Question 3 of 5

What is the main advantage of a linked list over an array?

Students answered1 / 3

Watch answers land, then reveal and debrief.

Teacher-gated help

Coach without giving away the answer.

Hint-only Rena stays beside the coding task, follows the teacher's policy, and refuses full-solution requests.

Set classroom guardrails

Hint-only Rena

Teacher policy

Can you just show me the solution?

Rena

Full-solution request blocked by classroom policy.

Concept gaps

Choose the next explanation from evidence.

Inspect class accuracy by concept and turn the weakest signal into the next worked example or office-hours focus.

View the educator dashboard

Concept gaps

Class accuracy by concept

Dynamic programming is your next office-hours focus.

Reusable material

Turn one live session into the next lesson.

Find a past quiz, inspect its question mix, and reuse what worked instead of rebuilding every warm-up from scratch.

Browse classroom material

Reusable library

Search your saved quizzes

Drop a past quiz straight into your next class.

Frequently asked

With a short join code on any device. No install, no full account required. They answer from their own screen while you watch progress live.

Recent from the field notes

All field notes

Interview Prep2026-08-05

How We Match Problems to Companies

The method behind AlgoArena company patterns: what we measure, what we deliberately will not claim, and where the limits are.

Read

Vibecoding2026-07-28

Vibecode Something, Keep It, Let People Play It

We extracted the assessment IDE into a standalone builder, gave it a public showcase where anyone can play and fork what you make, and added self-serve practice assessments. The loop is the point.

Read

Assessments2026-07-25

A Replay Should Show What the Candidate Actually Saw

Session replay is only evidence if it reflects the candidate's real screen. Two fixes: one continuous timeline that follows the candidate across questions, and an honest band for the time they spent orchestrating agents.

Read

For educators

Run live CS sessions your whole class can join.

Host live sessions, coach with hint-only Rena, debrief with real data, and reuse quizzes across classes.

Meet with the team

{A}

https://algoarena.net/classroom/lobby/classroom_intro_cs_demo

Join at algoarena.net/classroom

or enter code

CS2026

Game Settings

Questions

Time

10s to 20m per question

Topics: arrays, linked lists, strings

Waiting for a student to join...

Players

1 joined

NPNoah Parkready

You are the host

https://algoarena.net/classroom

Join a session

Classroom join

Enter the 6-character code from your host, then join the live room.

Classroom

The CS classroom, rebuilt for the AI era.

Host live algorithm quizzes, let students code in the room, and debrief the exact concepts that need attention.

Meet with the team Try a live classroom

Piloted in a Bryn Mawr College CS classroom. Free to start with a generous educator free tier.

Classroom pilot

Piloted in a Bryn Mawr College CS classroom.

Classroom is shaped around an instructor's real loop: start class quickly, see who is stuck, and leave with a useful debrief.

Read host notes

The classroom control gap

Shared visibility matters more than another black box.

Teachers and students are already using AI. Classroom gives the educator a visible role in setting boundaries, seeing progress, and choosing the next explanation.

60%

Teachers are already using AI for work.

Weekly users estimated 5.9 hours saved per week.

Gallup 2025 · 2,232 U.S. public-school teachers

18%

Formal workplace guidance is lagging.

Only 18% reported receiving formal guidance on AI use.

Gallup 2026 · 2,069 U.S. public-school teachers

56%

Students are bringing AI into the room.

Gen Z K–12 students use GenAI weekly. 80% of surveyed Gen Z worry AI may make future learning harder.

Gallup 2026 · 1,572 U.S. people ages 14–29

One live teaching loop

From first join code to the next lesson.

Four focused views show what the educator can control, what the student can ask, and what the class leaves behind.

Live room

Host the whole class from one surface.

Share a short join code, keep everyone on the same question, and watch submissions land without switching dashboards.

Host a classroom

Live question

Question 3 of 5

What is the main advantage of a linked list over an array?

Students answered1 / 3

Watch answers land, then reveal and debrief.

Teacher-gated help

Coach without giving away the answer.

Hint-only Rena stays beside the coding task, follows the teacher's policy, and refuses full-solution requests.

Set classroom guardrails

Hint-only Rena

Teacher policy

Can you just show me the solution?

Rena

Full-solution request blocked by classroom policy.

Concept gaps

Choose the next explanation from evidence.

Inspect class accuracy by concept and turn the weakest signal into the next worked example or office-hours focus.

View the educator dashboard

Concept gaps

Class accuracy by concept

Dynamic programming is your next office-hours focus.

Reusable material

Turn one live session into the next lesson.

Find a past quiz, inspect its question mix, and reuse what worked instead of rebuilding every warm-up from scratch.

Browse classroom material

Reusable library

Search your saved quizzes

Drop a past quiz straight into your next class.

Frequently asked

With a short join code on any device. No install, no full account required. They answer from their own screen while you watch progress live.

Recent from the field notes

All field notes

Interview Prep2026-08-05

How We Match Problems to Companies

The method behind AlgoArena company patterns: what we measure, what we deliberately will not claim, and where the limits are.

Read

Vibecoding2026-07-28

Vibecode Something, Keep It, Let People Play It

We extracted the assessment IDE into a standalone builder, gave it a public showcase where anyone can play and fork what you make, and added self-serve practice assessments. The loop is the point.

Read

Assessments2026-07-25

A Replay Should Show What the Candidate Actually Saw

Read

For educators

Run live CS sessions your whole class can join.

Host live sessions, coach with hint-only Rena, debrief with real data, and reuse quizzes across classes.

Meet with the team