3 00:00
    Codigami 1:42 @reverieyour best 1:58break it · +12 Elofall short · −3trial 4 of session · avg MARK 91

    Recording consent · once only

    The tape rolls during attempts.

    Recording is required for ranked play. Your screen is captured during the attempt. Tape uploads to the official Codeseum YouTube. You consent once — we never ask again.

    Not now
    Brief · plainALGO-008

    Given a list of numbers and a target, find the two numbers that add up to the target. Return their positions in the list.

    Three quick examples shown below. A few more are kept hidden — they run on submit. Mark is final.

    Examples

    • [2,7,11,15], target 9 → [0,1]
    • [3,2,4], target 6 → [1,2]
    • [3,3], target 6 → [0,1]
    Engine · Claude Opus 4.7Recording

    Prompt your engine. Every prompt and response is logged to the attempt — that is the point. Your API key is never logged or stored.