How to Play Spore Multiplayer: It Doesn't Exist Traditionally—But Async Features & Mods Fill the Gap
Spore has no direct multiplayer mode. Its online features were entirely asynchronous—designed for sharing, not simultaneous play.
Official Async Features (Still Work)
Sporepedia: Upload/download creatures, buildings, vehicles, planets. Browse, rate, comment, subscribe to creators. Your world populates with others' creations.
Challenges: Complete missions; scores upload to leaderboards. Others attempt to beat your time/score—not simultaneous.