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Could the lion one be "The Veldt"?
Yes, I think The Veldt is right, thank you! Nice to have identified one of the stories!
I know The Veldt is in The Illustrated Man. It could be that you read that, which would make them all stories by Bradbury. Or it may have been a collection of various authors — I'm afraid I haven't read all of the stories in The Illustrated Man and the other descriptions don't ring a bell.
Bump
Sounds interesting. Few of the stories sound like Goosebumps stories, but they are from the same anthology, they probably are not. Hope you find them.
OK, this has haunted me for more than a decade. I read a horror anthology when I was around 13 or so, too young, and I'd like to find it and reread it so I can find out if it was really THAT scary.
One of the stories is about a character who never learned to swim, then found swimming lessons for adults being advertised, went there, and turns out that the catch is that they're turned into literal fishes.
One of the stories was about a character who played a computer game, died in it, only to realize that it was actually real and that it was his turn to be "in the game" when he sees his own room show up on the screen with another player (?) controlling it.
One of the stories was about moths.
One of the stories was about a children's room in a future where they had like "backdrops" of a place instead of walls and the backdrop of the children's room was a savannah. Supposedly it wasn't real but I think the kid was eaten by a lion or something.
There was also something about teleporting?