Autosaving snapshots
When playing games it is convenient to be able to go back to some point in history. Swan has the feature of autosaving history snapshots:
In main menu, choose Options->Autosaving snapshots... On top of window check "Auto create in-memory snapshots", adjust other options there if you want, click OK and continue with playing the game.
Whenever you want you can open the same dialog again and browse through saved history:
Select some saved snapshot there, check "Restore selected snapshot" at the bottom of the dialog, and click OK. Also, without opening the dialog, you can quickly go back by pressing F5 key (default key is F5, but you can change it to some other, as you can see in the dialog).
Have fun!