I forgot the name of a time travel movie about 3 friends

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I forgot the name of a time travel movie where 3 friends using a time machine constructed by one of them to the woods. Does anyone remember the name?

They test the machine on a dog first; The main protagonist goes to the hospital that he worked in and finds out that his parallel world self died in a war; people are free to drive whichever car they find on the street; there's a brutal game where people are hunted and beaten.