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What are some fun lightweight mobile games?
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Three of my personal goto free options:
Nonograms are pretty simple logic puzzles in the same vein as Sudoku, but I enjoy them a lot. The app I personally use is Nonograms Katana.
Super Auto Pets is a really good, streamlined auto-battler. If you've ever played Autochess or Teamfight Tactics, its the same idea, but stripped to the down to the core principles and with a cute animal theme. Each turn you buy animals with abilities, then enter combat with another player and the animals automatically fight. Win 10 battles without running out of lives to win.
And not technically free without sailing the seas, but you should also be able to emulate gba games easily. Even if you don't like playing more precise games with the touch controls (like me) there are a few great turn based games like Advance Wars and Fire Emblem.