This computer game is based on BrainTeaser by Wim Nijland.
Choose digits from 1 to 9, split by reaction method into three groups: 1-3-7-9, 2-4-6-8, and 5.
The goal is to display all digits except 5, avoiding the field clearing.

The source code in Xtal Basic is attached —

Using EDIP, write the source code to a floppy disk and load it through the MAME emulator.
It works in Xtal Basic 4.2 and 5.0.

However, cannot save it with the SAVE command in any form due to a “Bad Data” error, and have the same problem with compilation.
What could be the reason?

A boot disk containing the compiler and source code is attached.

Compiled it using a CP/M-compatible operating system on MSX. The result, which requires the runtime (xr.com from the compiler package), is attached below.

Implementation of the logic game «Master Mind».

The source code and the compiled file are attached.

The color palette on the Einstein-256 seems to be better:

This model offers a total of 512 color shades.