01
Train without stakes
Work through trials at your current rank. Run the visible tests as often as you like, fail as often as you like. Nothing here affects your rank.
No clock, no limit, no consequence.
Train. Build. Prove.
Rank up.
Most platforms count the problems you finish. Codexa measures how you finished them, then awards a rank that holds up when someone asks you to explain your code.
- Ranks
- E → S
- Languages
- 4
- Pasting
- Blocked
Anyone can paste a solution. A rank is worth something only when someone watched you write it.
How it worksTraining and ranking are
Training and ranking are
deliberately separate
You can practise badly, at length, with no consequence. The rank only moves under exam conditions, which is the whole reason it means something afterwards.
- 02
Sit the exam
When the skills behind a rank are covered, an exam opens: unseen trials, a clock, and hidden tests. It is the only place a rank changes.
One session. No going back.
- 03
Defend the borderline cases
If the measurements disagree with the result, you answer a short question about your own solution. Passing it clears the doubt; skipping it does not.
Explain the choice you made.
IntegrityA rank means something
A rank means something
because it is watched
An assistant can write a solution faster than you can read it. So the exam does not ask whether the tests pass. It asks whether you wrote the thing that makes them pass.
Pasting is blocked
A blocked paste records its size and the time it happened never its contents.
Typing is measured, not recorded
Rhythm, linearity, and long pauses followed by a flawless burst. Structure, not text.
A review settles the doubt
One question about a choice you made. Nobody is judged on a measurement alone.
What is never collected: clipboard contents, screenshots, keystrokes outside the editor, anything typed in another window. If you code with assistive technology, say so in your settings: paste blocking is lifted and typing metrics stop being interpreted, no proof required.
RanksSix ranks,
Six ranks,
one way in
Everyone starts at E. Each rank is a supervised exam, and there is no shortcut past one: not a streak, not a subscription, not a solved-problem count.
- Awarded by
- Exam only
- Trials per exam
- 3
- Retake
- After cooldown
- Expires
- Never
- Rank Estart here
- Rank Dfirst exam
- Rank Csecond exam
- Rank Bthird exam
- Rank Afourth exam
- Rank Sfinal exam
Start at E, like everyone else
Training is open immediately. Sign in with your email: there is no password to choose.