Outnumbered: Improbable Heroes is a maths game based on City of Zombies that's being published by Genius Games, a US based educational games company. They have taken the core gameplay of CoZ, made some changes to the theme (it's now superheroes vs villains) and some gameplay tweaks. It's launching in the US soon, and should be available from retailers Worldwide from Q2 2021. Available to preorder now, you can find out more information here