A strange little side quest
The next time Monster Defence asks for one more try, remember that game ideas rarely appear from nowhere. The word 'checkmate' is linked to the Persian expression 'shah mat', used when the king was trapped. The same trail leads to another fact: Doom changed game design and distribution in 1993 by separating its engine from content and spreading widely through shareware. The screen is modern; the urge to test skill, pattern and timing definitely is not.