The reliable same-old tower defense model that the original Kingdom Rush nailed is present here, as it was in the first sequel Frontiers, but something's amiss. I can remember each tower type and upgrade tree from the first two games, but I can't impromptu recall ANY of them from Origins – somehow the third entry fails to be memorable. Additionally the formula is growing stale – despite the high level of polish, the Kingdom Rush series always specifies predetermined plots for tower construction, limiting the player creativity and ingenuity required in older games like Desktop Tower Defense.