358S: Boy Switches Places with His Parallel Universe Version

I need help finding a series I read about 10 years ago. I’ve been trying to find it for the last 6 months and have now made it a mission to find the series.
This is what I think I remember:
The books were in a public library in the young adult fiction section. It was about a boy that was transported to a parallel universe. I think it was a trilogy and one of the books had a purple-ish cover.I honestly don’t know if I’m remembering this right or mixing with another series.
The parallel universe version of him was then transferred to his world, so they basically switched places. They ended up meeting each other/themselves at the very end. The other universe he was transported to had knights I think? It was a fantasy world and different from his.

3 thoughts on “358S: Boy Switches Places with His Parallel Universe Version

  1. Marisa

    I don’t recall much in the way of fantasy elements, but Michael Lawrence’s ‘Aldous Lexicon’ or ‘Withern Rise’ trilogy might fit. There’s a version of the cover of A Crack in the Line (1995) that is purple, black, and white.

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  2. Sarah A.

    This sounds like Wayne Thomas Batson’s “The Door Within” trilogy, which fits the description completely as far as I remember the series. The second book (Rise of the Wyrm Lord) is purple.

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  3. Sarah

    I think this is The Door Within Trilogy by Wayne Thomas Batson, which fits every part of the description except maybe meeting his other self (but I could be mistaken). The second book is purple, and it is aimed at middle-grade YA audiences.

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