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    [The game] would read the second cartridge’s identifier, and then vary the layout of the bonus levels on that. Players could experiment with different games to find different sets of levels; for example, if plugging in Toe Jam & Earl gave a set of levels that was too difficult, maybe the player might have more luck after plugging in Altered Beast.

    Game ID as a RNG seed. Interesting. Going to drag my Genesis out to give this a shot.

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      I believe Monster Rancher also does this.