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This level was driving me crazy (mostly because of the character limit). The solution that I found is kind of silly: it turns out the removeItem function is dumber than you probably think it is.

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A good solution would be to remove an invalid item, and the function should silently try to remove the invalid item, but still allow passage. For some reason, even when you have the green key, but try to remove an invalid item, it still doesn't let you through, despite apparently returning false (passable).

Additionally it doesn't support injection there, so while "player.removeItem('greenKey'); player.additem('greenKey');" should work, it says "TypeError: undefined is not a function".

I thought https://gist.github.com/anonymous/cfe03f2ddb0052b38081 was kind of neat, as you still have to solve the puzzle a bit after using it.

I approached it like this:

player.removeItem('greenKey'); return 0;} if(1==1){('');

Full link: https://gist.github.com/anonymous/c78b439d8f2369e03f68

Basically, this let's you delete the green item once. After that, it makes sure that return true is never reached (because of the 1==1), so next passages through green are allowed. Kinda liked the sneaky (''); myself :P

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