yukicoder
Join weekly Friday-night contests of user-written algorithm problems
yukicoder is a Japanese contest site where users write the problems and hold contests. Almost every Friday night there is a numbered contest of five to nine problems lasting two to three hours, and there are also themed and code golf contests. Every problem stays in the archive with a difficulty level.
Free · No login · Browser
About yukicoder
It trains algorithmic problem solving and suits programmers from beginner to advanced. Problem sets usually range from very easy to very hard.
It runs in the browser and you log in to submit, often with a GitHub or X account. The site is in Japanese, so a browser translator helps with statements. It is free and shows standings and rankings.
On Breakpoint since 25 Oct 2026.
Made this game? Claim it →
Tips and discussion
No tips yet. Solved it? Share how, and wrap answers in ||spoilers||.