The building phase ends on August 7th and has $200,000 in rewards.
Join the Hyperion community on the Forum: Hyperhack: Build & Battle-Test Starts Now
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Stage A will be focused on Development from June 2nd to July 15th.
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Stage B is designed for Stress Testing running from July 15th to August 7th.
Read the thread: 
https://x.com/metisl2/status/1929590935622480259