It wasn't until I had given up and restarted two previous games playing Persia, that I found that strategic resources are restricted to the point of wrecking games. That accounts for my three abandonments. There are mods offering any number of bonus and luxury resources - but they don't matter when the game gets down to coal and oil and there are no resources. In my Game 3, Persia, which I have just abandoned, I never found coal. There was one oil, in water, stuck in no man's land between three of my cities and France. I could not purchase the tile - it was too far away. There was another oil behind two countries one friendly one neutral between me and it. I was suzerain over three city states. None had oil or coal. I was surprised to find little comment here. I found a few complaints on Reddit. There are horror stories there revealing worse experiences on strategic resources than my own. Apparently the game designers intended strategic resources to be "extremely rare." They're supposed to be scarce to make you fight for them. Going to the extreme however just wrecks the game, when time after time, critical resources are permanently out of reach. It's small consolation that specialty units require no resources. I didn't have iron but with Persia, immortals don't need iron but in the later game when critical resources are absent or completely out of reach, my interest starts to nose dive. I started out this final game in a jungle region and used the "chop" extensively so that by the time I was researching flight, my four major cities had encampment, campus, commercial hub, industrial zone entertainment and theater districts. So, I thought I was coming along quite well. I don't really see the point of mods offering super abundant luxury and bonus resources. They become meaningless when there are no strategic resources to advance units. It would be nice to see someone address that issue with a mod or for the problem to be fixed in the next patch.