Good PC games with low system requirements, smooth and small sized?

Can anybody list some games with low system requirements, and are smooth (lagless) and small sized?
A game which would make a good lets play. A game with more adventure and long storyline? (And yeah, the game could be paid or free both)

Leauge of legends
minecraft
Racing games often don't need a great computer
Sims
South park stick of truth

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