A strange little side quest
One reason strategy games keeps producing good game ideas around Castle Defense New is that its history is full of strange turns. Modern chess traces back to the Indian game chaturanga, recorded around the sixth century and built around pieces representing parts of an army. There is another connection worth keeping in the same mental pocket: Spacewar! appeared on MIT's PDP-1 in 1962 and became one of the earliest influential computer games shared among programmers. It is a good reminder that simple game mechanics can carry a surprising amount of history.