RoboSport (Mac OS Classic)
This game has debugging material.
In RoboSport, each player gives a team of robots exact orders in advance: where to move, when to duck, how long to bombard that alley with automatic weapons fire. When the round begins, all robots simultaneously execute orders until disabled. Will your plan survive contact with the enemy?
The RoboPlayer application (for watching recorded gameplay movies) contains this inaccessible menu.
The equivalent in the main RoboSport executable has one extra command, "Debug Seed"...
...and a dialog box that would have let you manually supply a seed value to the random number generator.
Also present are some remnants of a level editor: