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There are opening Phases. The SFX Coaster was meant to open in Phase 3. Unfortunately we currently don't have information about what ride will open when exactly. As a matter of fact: It's a bit unsure if these Phases are still relevant. With the Covid-Delays it would make sense to open phase 1 and 2 at the same time.
I managed to ask a question to the staff at the park about the grand opening and they said grand opening will be on June 1st.
POV Samba Gliders
Looks like the SFX coaster entrance is slightly open.