📣 How the Bullhorn works
The Mushroom Battle Bullhorn lets you call friends to a mushroom you have joined. Open the mushroom's detail screen, tap "Call Friends for Help", pick friends and send.
- You can use it for free once a day.
- One call reaches up to 10 friends.
- The Bullhorn is used up when you send the call, even if nobody comes.
- A call does not hold a spot. Someone else can fill the mushroom first.
- Joining a mushroom you were called to counts toward your 3 free battles a day, and a full mushroom (5 players) needs a Mushroom Recharge Ticket.
🎃 Why players say "3 times on weekends" in October
During the October 2026 Halloween event, the Bullhorn can be used up to 3 times a day on Giant Halloween Mushroom dates: Oct 3–4, 10–11, 17–18, 24–25 and 28–31. That's where "once on weekdays, three times on weekends" comes from. Outside those dates, the usual once a day applies.
🤝 Can an invited player call more friends?
Yes. The Bullhorn works from any mushroom you are taking part in, so after you join through someone's call you can use your own Bullhorn there. Your friends get the call from you. The game also says other users don't see that you asked friends for help, so the person who first invited you won't know who came in through your call.
🙏 The manners players follow
- The person who invited you may be saving the empty spots for specific friends.
- If you share a cafe, chat group or Discord with them, many players ask first.
- If there's no way to ask, a common habit is to leave the spots alone.
- Some players feel it's fine to fill spots that have stayed empty for hours.
⚠️ The etiquette above is what players commonly do, shared in the Korean community. Bullhorn rules are from the Pikmin Bloom Help Center and the official October 2026 event notice.
For the 3-a-day battle limit and full mushrooms, see our free slot and paid slot explainer. For postcards from battles, see pretty postcard mushrooms.
A pure spot only gives one decor type, so you can build up the Decor Pikmin you want.
🗺️ Open the pure spot map →Sources: Pikmin Bloom Help Center — Mushrooms; Pikmin Bloom October 2026 Halloween event notice; player answers on the Naver Pikmin Bloom cafe (in Korean).