Yes, you can use the same weapons by doing that. However, say I found both the club and the sword in the town. When I get to the forest (which is loading a new game pack) my only option is to start with 0 weapons, or the 1st weapon (the club), I cannot start with any additional weapons. So starting a new game pack is like starting a new game.
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Ohhhh, yeah you're right. So if you had already collected them, they don't carry over.
I suppose narratively the best way to handle that is to explain that you lost the weapons between scenes. Or a less aesthetic but practical solution may be to just start the next level by having your then current weapons sitting just ahead of where you start.
Also, am I correct that the Player sprite when placed in the map editor is always facing down?
I read later that you could add the weapon (or key perhaps) to the new game pack, but make it invisible and have no pickup sound. The problem would be if they did not get the weapon, there is no if/then equation to determine whether to give it to them or not. Anyway, yes, the engine has limits and it was certainly fun and challenging to work within them.