Game Idea Tell me what you think

Background Info:
Okay once again this pertains to little game. Okay when loading the map from the .txt it looks like this. M1-1=121,1,3,hello,…

Idea:
I was thinking that after i load my map file i would load my saved game and have that replace any varaibles that had changed in the world. This way when the map gets bigger its save file can adapt to the new area.

Questions
1.) Are there any of you that can think of a better way of loading my saved game.

2.) Can you think of any problems that im not seeing.