Megaquarium

Surprisingly addictive, not too challenging but it has enough strategy to keep me up well past my bedtime.

Very nicely balanced mechanics plus intuitive menus and controls. Anyone who likes builders/management games needs to try this one!

It's so hard to find a good zoo game these days. Luckily for all the fish enjoyers out there, Megaquarium rules. Fair warning, it's more of a freeform puzzle game than a traditional management sim - you have to set up your tanks and organize your staff and equipment in such a way that the operation runs smoothly. It's very satisfying, and I rank it among the great games of the sadly very shallow genre of zoo sims.