The bigger challenge for long-running titles is attracting new players and going up against the new giants of the games industry.
Fans stick with titles such as Fortnite, Roblox and Call of Duty - so-called "live service" games that offer a revolving, ever-updating selection of content - for months if not years on end.
With CrossWorlds, there are plans to add a revolving cast of characters and offer players a "season pass" add-on to access certain extras - a feature seen in many online titles.
Mr Iizuka says the goal is to "make sure we're refreshing the game every month and to really make it a fun experience to constantly come back to".
It's a common practice, and one game companies are using to keep players engaged as development time and costs keep rising.
"There used to be a time where you released a new game every year," says journalist Chris.
"That's not how things work anymore in video games, they often take five years-plus to make."
Chris says rolling content drops are a good way to maintain interest once the hype of a big launch has faded.
And it makes sense to "embrace" the modern gaming landscape, he says.
For example, he says one of the most popular recent Sonic releases was an official game within Roblox.
Alongside the successful movie tie-ins, Chris says, it's a way of "introducing Sonic the Hedgehog to those players and then hopefully convincing them to step across and play something like CrossWorlds".