Procedurally generated puzzle panels with procedurally generated rules.
Here's an excerpt from Forgetting's Steam description:
Forgetting is a puzzle game that changes with each playthrough. Decipher the meaning of the symbols to solve puzzle-panels, and gain access to new areas of the map. Explore the procedurally generated world at your own pace, but once you reach the end, you'll find yourself right back where you started with an unfamiliar map and all new symbols.
Discover the logic rules of the relics and learn of the settlers that left them behind.
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