I'm jonesing for these tower defense games. The first edition was released by Robot Entertainment in 2011, Orcs Must Die 2 came out in 2012, OMD Unchained (online multi-player) was from 2014 and OMD 3 was from 2020/2021. They're all great fun and I am sad that we may never get an OMD 4. Game 1 was single-player, 2 and 3 had coop mode too.
I toyed with the idea of creating a community here for the games, but I'm not sure there are enough fans / enough things to talk about now.
For now, here's an awesome slide show from Unchained, for any fans: https://de.ign.com/orcs-must-die-unchained-ps4/112585/gallery/embed
I tried the series and was never a huge fan, (I was always a Sanctum kinda guy) but picked up Orcs Must Die 3 recently and been really enjoying it! Seems like the best in the series so far.
Still waiting on Sanctum 3 tho