Optiver number logic
Train rigorous number sequence families under a 25 minute deadline.
26 sequences · six pattern families
Start free practiceNo account. No card. Your first run starts here.
Six pattern families rotate through exact arithmetic, interleaving, recurrence, and rational rules.
Traintheoperationthatcostsyoupointsbeforetheclockexposesitagain.
Preparation guide
Practice in one uninterrupted block and use the same keyboard controls you will use on test day. Speed improves when answer entry becomes automatic.
Review both accuracy and response time. A slow correct answer can still reveal the operation family that will cap your score under a fixed deadline.
Repeat weak families separately, then return to a full mixed benchmark. This keeps technique work distinct from pacing practice.
Answers before signup
The simulator serves 26 generated sequences across differences, interleaving, recurrences, Fibonacci variants, offsets, and rational patterns.
The practice preset uses +1 for correct and −1 for wrong to reward selective confidence.
The hiring firm does not publish a stable universal cutoff. Use accuracy, pacing, and repeatable improvement rather than an unsupported single threshold.
Yes. The embedded trainer starts immediately and stores completed guest runs in this browser.
Separate calculation errors from slow correct answers, then drill the slowest domain and question shape before repeating a full benchmark.
Yes. Multiple choice drills support number keys and A, S, D, F. Typed drills accept exact decimals and fractions.
Keep question-level timing locally and expose the family slowing you down.