Extra copies for any Breakthrough 10 Buddy, SP Support, or Overdrive can be exchanged for Success Stones. Since this requires Summons to be at Breakthrough 10, Success Stones are extremely difficult to get.
It's been confirmed that 1 extra copy can be exchanged for 6 Success Stones.
Success Stone Uses
Purchase From the Success Stone Shop
Success Stones can be exchanged for Buddy, SP Support, and Overdrive Breakthrough. So far, this is the only way to gain Breakthroughs for Buddy, SP Support, and Overdrive you can unlock for free.
Even if you don't have the Buddy, SP Support, or Overdrive yet, you can purchase its Breakthrough through the Success Stone Shop. This will unlock them, allowing you to bypass the required unlock conditions.
Note!
Since you can connect to the Different Dimension Box, it's great to get them first.
Hologram Ticket
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Early Game Guide
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