Crowds in games used to be a big focus on prior generation consoles, culminating in - and ending with - Assassin's Creed Unity. However, back in the PS2 era, developers really went for it and with Ikusagi, also known as Demon Chaos in the UK, we saw an engine that could deliver up to 65,000 enemies on-screen at 60fps. So what does that look like? John has the story.