Today’s Game is fallout New Vegas (I’m on a bit of a new Vegas bend). I took this screenshot while doing the Ghost of She quest line. I made surprisingly quick work of the quest with the Grenade Launcher (I still have over 200 grenades leftover from the Deathclaw Quarry)
Can I use an existing save?
Short answer: No.
You cannot use an existing Fallout: New Vegas save to play TTW. Even though a save might load, there are too many changes for it to work correctly. No support is provided if you do this anyway.
Saves made with previous versions of TTW will not work with 3.x. Too many changes were made to allow saves to be compatible.