I.T. Kid

An RPG and a strategy game in one: you spend gold on warriors, archers and siege units, hold your own base, and push a lane until the enemy tower falls. Each stage is a slow advance rather than a single fight -- the units in front of the tower have to be peeled away before the tower itself is worth attacking, which is why the game's own advice for the early waves is to avoid the tower and attack one by one, leaning on the Tank to break it. Levelling the hero is what unlocks the heavier units and the better equipment. CrazyMonkeyGames published it on 17 October 2007; its own page counts more than five million players, making this the most-played entry in the five-game series.