How to implement a "record" & "replay&quo

[Damot]

How would any of you recommend implementing a "record" feature in a game, so a player can replay his game?

I'm assuming the best way would be to record his/her keystrokes and read from a record of them rather than the keyboard when replaying. Everything else in the game would be the same. Is that the right approach?

[Robert Kosek]

You also need to store the random seed when the game starts, otherwise everything will be random each replay. ;)

[JernejL]

you store input per frame, also your game must be totally predictive and run at fixed frame rate.

[NecroDOME]

Yup. Using key-strokes is the less-data-consuming.

But the synchronization needs to be perfect, and yes, the game update must run on a fixed frame rate so its easy to reproduce.