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Variables are reset every time the reader restarts a story. If you'd like to remember the value of a variable after the game, use the <<remember>> macro. It works exactly the same way as <<set>>, except it stores the variable in browser storage that remains between sessions.
At long last, you have escaped the dungeons. <<remember $escapes += 1>> So far, you have escaped the dungeons <<print $escapes>> times.
If you are only interested in remembering the current state of a variable, you don't need to include an assignment: