Even in zero, one and two dimensional universes, time exists. If there was a outside to our Universe. Who's to say the user could control time? Wouldn't they just see everything at once?
I'll give you an example of what such an observer
might see. Of course, anything is possible, but the following is fairly consistent with the known laws of physics. I'll treat the "outsider" as if our universe was running on a "cosmic computer" and they're looking at the computer display, free to examine the memory as they like. They can look at the beginning of the universe, the end, or any time inbetween.
They'd see the wavefunction, which spreads out from the beginning of the unverse like a cone, encapsulating every possible state of the universe at every moment. The wavefunction is like an evolving probability, only a special kind of probability that uses complex numbers (numbers that have an imaginary component) that can be positive or negative and bigger or smaller than one. The evolution is deterministic, the wavefunction always comes out looking the same.
From that wavefunction he might pick some spacetime moment and examine it for a human flipping a coin. What he'll find is a blur of a human smeared over all the quantum posibilites ranging from flipping and getting heads to flipping and getting tails, with most in blurry states where they're flipping both heads AND tails.
The outside viewer might also have a "decoherence" display running on a second monitor, I expect it would be a pretty standard plugin for such outsiders. On this monitor, the blurry "in-between" realities almost completely disappear for large objects, so he'd see a nice clear image of both the human flipping heads in one universe and the human flipping tails in the other.
So based on the most frequently accepted interpretation of QM used at the moment, the outside observer would see a universe where every possibility is explored side by side.
Now, perhaps instead they employ a "collapse" plugin. Now it's a bit trickier, because everytime you activate collapse the big cone of expanding wavefunction collapese down to just one point, and all future evolution only continues on from that point. So running the collapse module constantly isn't recommended or you'll lose all the quantum evolution (and the program won't look like our worlds, since things like the two slit experiment won't work anymore.) But run here and there, it's fine. Run on the human coin flipper, the computer will randomly choose to either show a heads flip or a tails flip.
Now, why one or the other. We are back to square one. Perhaps its a perfectly predictable pseudo random number generator, something like the Hidden Variables Theory. Or perhaps it's some further deep QM true randomness the cosmic computer can utilize. The point is, we have no scientific information to indicate there is a determinsitic pattern to such a collapse, and so it's unscientific to assume there is, and says more about individual philosophy and taste than it does about how the universe really works.
"In theory there is no difference between practice and theory. In practice, there is." - Psychology Textbook.
