Making Unlockable Extra Scenes

[MisterHarold]

Hello. I want to make a scene gallery where the player can play through unlockable scenes after completing a specific ending. My problem is, how do I lock that scene?
I already have a button on my main menu that goes to the extras screen with scene buttons.
I used the code here https://www.renpy.org/doc/html/rooms.html#replay

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     "And finally, I met the wizard himself."

label meaning_of_life:

     scene

    "Mage" "What is the meaning of life, you say?"

    "Mage" "I've thought about it long and hard. A long time, I've
            spent pondering that very thing."

    "Mage" "And I'll say - the answer - the meaning of life
            itself..."

    "Mage" "Is forty-three."

    $ renpy.end_replay()

    "Mage" "Something like that, anyway."

For the button, I used Start instead of Replay because I don't want to revisit a certain point that I read through the story. I want to read a hidden/secret scene which can be unlocked after getting an ending:

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textbutton "The meaning of life" action Start("meaning_of_life")

The player needs to complete an ending first before unlocking that scene. How do I do that? Any kind of help would be greatly appreciated.

[Remix]

You need to use the Replay() action, not Start, then use the locked attribute

action Replay( "meaning_of_life", locked=True ) # only clickable if meaning_of_life has been played through at least once.

Alternatively, if you insist on using Start or Jump or whatever you will need to implement a locking system of your own then control the context that the labels are replayed in so as to restrict altering of any variables or call stack during the replay...

[MisterHarold]

You need to use the Replay() action, not Start, then use the locked attribute

action Replay( "meaning_of_life", locked=True ) # only clickable if meaning_of_life has been played through at least once

Hmm. Sorry if I forgot to specify on my post but, what I meant was playing an unlockable scene after getting an ending. Not replaying a point that you read through in the main story.

[Remix]

I'd just create a list and have it store a set of 'accessible' values then open them at end and access labels if unlocked...

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default accessible_extras = [ False ] * 5 # 5 endings here - expands to [False, False, False etc ]

label ending_0:
    "words"
    $ accessible_extras[0] = True

label extra_content_0:
    "extra words"

screen extra_content():
    fixed:
        for k in accessible_extras:
            textbutton "Extra Scene [k]":
                sensitive accessible_extras[k]
                action Jump( "extra_content_{}".format( k ) ) # jumps to extra_content_0 etc

Note: If the game actually hits a final return (going back to the main menu) you might want to use a persistent list so it works across different playthroughs