Hole.io vs Zombs.io
Hole.io
Hole.io is an IO game where the sole objective is to suck as many things (or other players' smaller black holes) into your black hole just so you can grow it. The arena you'll be playing in is filled with plenty of buildings, moving vehicles, mailboxes, and trees that you can gobble up, but be careful! Other, larger black holes might go after you and gobble your black hole up instead! At the end of the day (there's a time limit), the player with the highest bulk, and hence, score, will win the game.Hole.io is pretty similar to Agar.io in many ways. However, you won't be able to eject your mass to propel your black hole forward. If this sounds like fun to you, you can check out the game for free on your browser!
Zombs.io
Zombs.io is in some way a more in-depth version of Moomoo.io. It's basically a strategy game where you build a base as well as defenses, like towers and walls, using the resources you've gathered and once everything's secure, you can then put in your gold stash to start the defending. You'll need to defend your stash from hordes of zombies who will usually attack at night along with other hostile players. You can also build gold mines to generate gold and upgrade your gold stash, which will in turn let you upgrade your towers and walls. You can even spend the cash at the shop to buy better weapons or upgrade your existing ones.Zombs.io may be the more interesting game, as compared to Moomoo.io, namely because it has a zombie- and tower defense-theme. If this is a game for you, be sure to check it out!