Pick a project. Ship it.
Every project has a spec you can paste straight to Claude, a plain "done when" check that decides whether it's actually finished, and hints if you get stuck. Rewriting the spec in your own words counts as playing on hard mode — and when that stops being enough, there's a real hard mode at the end of the tabs.
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How to use a spec
The spec is a starting point, not a script. Paste it as-is your first time. After that, change it before you send it: different theme, different rules, different twist. The "done when" list stays the judge either way. And when you clear one, the box remembers it.