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WARNING: The allowable number of save slots has been decreased to 4 plus the autosave.
In-browser save slots have been decreased to 4 plus the autosave, from 7 plus the autosave.
This was done because players with smaller browser local storage limits, and those with large NPC counts and thus large saves, were exceeding the allowed size causing errors.

AW has a lot of simulation data, so saves are not small like most text web games.
We're actually pretty good about keeping all non-necessary data out of saves, even serializing things into arrays and then rebuilding on load with class constructors.

We're planning on switching to executable releases, which should allow us to increase the number of save slots again.
The main reason for switching to exe is to prevent game data corruption due to leaving an AW tab open in the background, and general browser memory-saving shenanigans.

Remember, you can use the save-to-file function, which is the safest way to store your game data anyway. There are also no limits on how many saves you can create this way.