Rules & scoring

How BDChallenge.com and every iChallenge arena scores play, and how funded prizes work.

Daily round

Each arena has one daily round of five questions, the same for everyone, ramping from easy to hard. It resets at 00:00 UTC.
You get one ranked attempt per arena per day. Practice rounds are unlimited but don't count toward today's leaderboard, and only your first three practice rounds per arena per day earn XP.
You have 20 seconds per question. Scoring: 100 points per correct answer, up to 50 speed points, a combo multiplier (×1.1 to ×1.5) for correct answers in a row, and 150 bonus points for a perfect round.
XP from a daily round = points ÷ 10 + 20 for finishing + 2 per streak day (up to 30 days). After five daily rounds in one day across the network, further daily rounds earn half XP.

Your streak grows by one for each consecutive UTC day you finish a daily round on any arena. Every 7-day milestone earns a streak freeze (hold up to 2), which covers one missed day automatically.
Levels come from total XP. Leagues (Bronze, Silver, Gold, Platinum, Diamond) reset weekly: each Monday the top 20% of active players in a league move up and the bottom 20% move down.

Streak challenges complete when you check in on consecutive days for the stated number of days.
Proof challenges complete when an entry is approved by a reviewer or receives 5 votes from players at level 2 or above. Entries on challenges with a funded prize always need a reviewer.
Proof must be your own work, public, and suitable for all ages. We remove entries that break these rules, and may reset scores gained by automation or multiple accounts.

XP, levels, streaks, leagues and badges have no cash value and can't be exchanged or transferred.
A prize exists only when a challenge card shows a funded prize. That card and the challenge page state the prize, the sponsor, the closing date and how winners are chosen. No purchase is necessary to enter or win.
Winners must have a saved email so we can reach them, and may need to confirm eligibility where local law requires it. Void where prohibited.

Your handle, level and leaderboard scores are public. Your email is never shown to other players or sold. We use it to save your profile and, if you win, to contact you.