About this game
Each round shows a short, syntactically valid code snippet with one to three planted defects and a tier-scaled countdown (90/120/150 seconds for novice, intermediate and expert). You click every line you would flag in review and submit, or the timer runs out. All defects are then revealed with their category, root cause and fix: found lines turn green, missed lines red and false flags amber. Scoring gives 100 points per defect found, subtracts 25 per clean line flagged, and adds a time bonus only for a perfect round, with grades from D to S. Puzzles come from a seeded generator over hand-written templates and single-line mutations, so rounds are reproducible and work offline; a daily challenge hashes the local date into the seed so every player gets the same puzzle, and only the first attempt each day is scored. A local reviewer profile tracks rounds, best and average score, daily streak, and accuracy across logic, null-safety, security, performance and style.
