Once aligned, the cutout window on the wheel will display a single character (e.g., "K" or "3" or sometimes a Japanese kana symbol). Type that into the game.
Fast-forward to 2026. Original copies of Knights of Xentar on CD-ROM are rare, and the physical code wheel is even rarer. Many surviving copies are missing the wheel, or the wheel has been lost, torn, or destroyed. Furthermore, players using digital archives, abandonware sites, or GOG-like re-releases often find the game image intact—including the copy protection routine—but without any accompanying physical artifact. knights of xentar code wheel
On abandonware/retrogaming sites (e.g., Archive.org), search for: Once aligned, the cutout window on the wheel