#3
Infinitode 2 is the kind of game that looks like a diagram and plays like an obsession. The research tree alone is a project. You are not just placing towers and upgrading them; you are making decisions about upgrade pathways, portal routing, and tower type synergies that compound across dozens of runs. It has a mobile version, but the PC build on Steam is the one to play, and it runs on practically nothing. I kept coming back to it on my laptop between other sessions, one run turning into three. The abstract visuals put some people off, and fairly so. If you can get past the aesthetic, the depth underneath is real.