That depends on interpretation of 'good' and 'strategy'. Bloons Tower Defence 5 is fairly well known as something you can outright purchase, and complete witho

That depends on interpretation of 'good' and 'strategy'. Bloons Tower Defence 5 is fairly well known as something you can outright purchase, and complete without IAP. Unfortunately it still has them... And TD doesn't tend to be for beyond casual gamers. (What is good strategy?) Shattered Pixel Dungeon is a fine rogue, without IAP. Nothing special, nothing terrible. I found Enchanted Fortress somewhat addictive. No IAP. Somewhat simple premise, but decent execution.