A strange little side quest
The fun part of looking behind Soldier Defence is seeing how many older ideas are still alive in modern play. The word 'checkmate' is linked to the Persian expression 'shah mat', used when the king was trapped. That old idea kept changing rather than disappearing. Doom changed game design and distribution in 1993 by separating its engine from content and spreading widely through shareware. So a round of Soldier Defence is not just a quick distraction; it is a tiny stop on a much longer strategy games timeline.
