if i were to make one again, I would probably save the state of the game after each input than save each input, that theoretically would have solved many of my problems. it may or may not help depending on the game, but hopefully this advice is helpful
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That would certainly work, but a transaction system would probably be a lot less memory. I'm actually saving the results rather than the inputs. Something like a player moved 1 unit right and 3 units down and died, or a box moved one unit left
As you said it depends on the game so the full level state should be fine for a lot of cases