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What are some fun lightweight mobile games?
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Simon tathams puzzle pack
Any of the "colors" series from 'bart bonte' (search yellow, or orange, or blue and he should be the first to pop up, his other games are good too)
Balatro (the only one I'm not sure how light weight it is, I think it should be pretty light weight)
(As others have said, lichess)
Pythagorea
Magic research 2
Rebuild 3
Any of the "pathpix" series
Slice and dice
Unciv
A hundred more recommendations that are "okay" level of fun