...pew...pew pew....pew pew pew...
Games I am currently playing and I haven't spent a dime on except where noted.
iOS
Clash Royale
Card based RTS - great for quick matches < $5 a season for Pass Royale - well worth it if you're trying to quickly level up your deck, but it's not a pay-to-win scheme
Word Chums
Like Scrab...