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- 5 worlds, Mark Siegel and Alexis Siegel ; illustrated by Xanthe Boume, Matt Rockefeller, and Boya Sun
- The red maze, Mark Siegel, Alexis Siegel ; [illustrated by] Xanthe Bouma ; illustrated by Matt Rockefeller ; illustrated by Boya Sun
- The amber anthem, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Boya Sun, Matt Rockefeller
- The Cobalt Prince, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun
- Siegel, Mark, 5 worlds, 05
- Siegel, Mark, 5 worlds, 01
- Siegel, Mark, 5 worlds, 03
- Siegel, Mark, 5 worlds, 04
- The sand warrior, Mark Siegel, Alexis Siegel, Xanthe Bouma, Boya Sun, Matt Rockefeller
- Siegel, Mark, 5 worlds, 02
- The emerald gate, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun
- 5 worlds, Mark Siegel and Alexis Siegel ; illustrated by Xanthe Boume, Matt Rockefeller, and Boya Sun
- The red maze, Mark Siegel, Alexis Siegel ; [illustrated by] Xanthe Bouma ; illustrated by Matt Rockefeller ; illustrated by Boya Sun
- The amber anthem, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Boya Sun, Matt Rockefeller
- The Cobalt Prince, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun
- The sand warrior, Mark Siegel, Alexis Siegel, Xanthe Bouma, Boya Sun, Matt Rockefeller
- The emerald gate, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun