CodeArena - a real-time competitive coding platform for 1v1 battles. Instead of comparing stats like “I solved more problems than you”, users can directly face off in live coding duels. Features: * 1v1 private battles with friends * Public matchmaking (open arena) * Ranked matches (Easy / Medium / Hard) * Real-time opponent progress * Rating system based on wins/losses * Sandboxed code execution + anti-cheat reporting