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Challenge Center

Call someone out. Academically.

Challenge any student to a time-bound, subject-based contest. Accepting is how you climb — declining costs you.

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What you get

Why Challenge Center works

Quiz duels

Both players answer the same timed questions, drawn from the question library or generated by Zilly. Highest score wins; speed breaks ties.

Debate challenges

A one-on-one debate room on your motion. You propose, your opponent opposes, the audience decides.

Creative writing and design

Both players respond to the same prompt before the deadline. Entries stay hidden until both are in, then the community votes.

Problem solving

Set a problem, both submit a worked solution, and let other students judge the clearer, more correct answer.

How it works

Using Challenge Center, step by step

  1. 1

    Pick an opponent and a format

    Choose the subject, the level and the type of challenge. Your opponent has 48 hours to respond.

  2. 2

    Compete before the deadline

    Quizzes are timed per question. Creative and problem-solving challenges give both players the same submission window.

  3. 3

    Result and rank

    Quizzes are scored instantly. Voted challenges close after 48 hours of community voting. Ranks update the moment a result is in.

The rules

Challenge rules

These rules are what keep Zelo a place of active participation rather than passive scrolling.

Win
+40 points. Your rank progresses.
Draw
+20 points each.
Lose, having competed
+8 points — taking part is always worth more than avoiding.
Decline
−25 points. Declining a challenge demotes you.
Ignore until it expires
−30 points. Silence costs more than an honest decline.
Accept, then fail to show
−35 points, and your opponent is awarded the win.
Repeated avoidance
Decline or ignore 3 challenges within 30 days and each further one costs an extra −50 points.

Questions

Good to know

Can someone spam me with challenges to wreck my rank?
No. A student can issue at most five challenges a day, cannot re-challenge the same person for three days, and nobody can have more than three unanswered challenges waiting at once.
Where do quiz questions come from?
From the Zelo question library, which teachers add to, or freshly generated by Zilly for your chosen topic. Neither player sees them before starting.
Who votes on creative challenges?
Any student except the two competitors. Entries are shown side by side, and each voter gets one vote.
What if I genuinely cannot take part?
Declining promptly costs less than letting a challenge expire. The rules reward honesty and showing up.

Keep exploring

More of Zelo

Content Feed

Essays, poetry, research, art, infographics, video and audio — sorted by subject and level.

Read on

Debate Rooms

Timed rounds, evidence on the table, an audience vote and a moderator’s scorecard.

Read on

Gem Ranks

Nine ranks from Quartz to Diamond, earned by contribution — never bought.

Read on

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