Reply to Re: 2 more development qestions.
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You can not use vision to control tiles. You can however attach a script to a screen to change the tiles around with load_tile(), but I don't think it alters the hardness (never done this before). Also, it just changes the actual files around for the tiles, not the individual tiles.
Depending on what you want it to do, you can use multiple map files as well to swap around Just make sure you never touch any sprites on the other maps or things will get hairy. If you take this path it will require experimentation and I suggest you finish the whole game first, THEN create the second, third, ... map to alter the tiles so you're 100% sure sprite numbers won't be altered.
Depending on what you want it to do, you can use multiple map files as well to swap around Just make sure you never touch any sprites on the other maps or things will get hairy. If you take this path it will require experimentation and I suggest you finish the whole game first, THEN create the second, third, ... map to alter the tiles so you're 100% sure sprite numbers won't be altered.