How do I pack a game to nest it into another game?

i`ve made a minigame but i would like to access it and others from a root game.

Some like a labyrinth with doors each one when opened triggers a minigame.

After that nesting all that into a graphic novel, in a way that reached some point in the history the gamer gets into the labyrinth.

i know that everyting can be done as a unit but it may be messy as doing it separately and then relate each file into each point of the root game.

I was thinking on exporting a game as a sigle file html, but how y get that page from the root game?