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In the alt-final stage, all terminals can be used indefinitely, they reset the door to the opening state if the door was already open. This also includes the secret terminal, which counts as a secret each time it's used, allowing you to discover more secrets than available in level

Stumbled by the game by accident, while browsing some Speccy libraries on ZX emulator for Nintendo DS. Gameplay-wise, pretty good, also pretty challenging. The music really stands out though! I pretty much left the game alone, with menu music on for a while, because of how good that particular tune is.