Mario Tactics is a 1978 tactical role playing videogame made by Neenteendo.
You can play as either Mario or Luigi, against an onslaught of Goomoos and Koopoos made by the BBC. The map is about 100x100 squares and you can only move one space at a time. You instantly kill the Koopoos and Goomoos if you touch them you win.
The BBC made about six Koopoos and Goomoos to Attack the Mushroom Kingdom. You must go to them and kill them. When you succeed, Mario will start dating Peach.
Most called it “The most magnificent tactical RPG to ever walk this world.” IGN gave it a 3333/10.