Good news, the barrier in the Dreamplane does not require you to have beaten all the levels in the same "
timeline"
.
All it needs is for you to have solved the secret rooms across any number of timelines - this means you can always restore back to any level, solve a secret room, then restore forward and go to some other level. You can then also restore to the Dreamplane once all secrets are conquered.
Other later official holds (The City Beneath, Gunthro and the Epic Blunder, The Second Sky, etc.) are better about letting you walk back to whatever level you want to solve in your same save file timeline without needing to restore.
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Quick links to my stuff (in case you forgot where it was):
Click here to view the secret text
[Last edited by Chaco at 03-22-2025 01:57 AM]