15
PC Games to Play with my Five-Year-Old
(lemmy.ca)
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I'd highly recommend the old Humongous Entertainment games. They were high quality kids adventure games with fun worlds to explore, characters to talk to, a million different things to click on that give an amusing reaction, and simple puzzles to solve to advance the story. I'd say to start out with Putt-putt and Freddie Fish, then move onto Pajama Sam and eventually Spy Fox.
I had a blast with those growing up, and I think they still hold up well.