First screen when someone taps a challenge link. Every multiplayer conversion flows through here. Real user feedback: confused, bouncing, replaying same colors.
No name input on entry. Name is asked after the game finishes, or auto-generated. Removes the biggest friction point.
Score to beat is visible. The competitive hook lands immediately. "42.3/50" triggers "I can beat that."
One clear CTA. "Play" or "Accept challenge" — no ambiguous arrow icon.
Brand micro-copy. "No signup needed" / "Free · Instant · No account" / "Just play." — reinforces the philosophy.
Replay detection (separate fix): When re-visiting a played link → fork to "See results" / "New round" instead of same colors again.