I asked Claude Opus 5.5 to build a typing game end to end, from one prompt. Here's what it made (open source, free to play)

A developer used Claude Opus 5.5 to create an end-to-end typing game from a single prompt. The game, which is open source and free to play, features a global leaderboard and adapts to the player's skill level for fair progression. It is fully responsive and allows optional GitHub or X usernames for avatar display without requiring a sign-in. The developer utilized Sonnet 5.5 subagents for parallel tasks during its creation.

This report uniquely details the use of Claude Opus 5.5 and Sonnet 5.5 subagents to build a complete, open-source typing game from a single prompt, unlike typical AI-assisted development.