User blog comment:--MULLIGANACEOUS--/Valentine's Day 2019: Massive nerfage!/@comment-24233482-20190215072627/@comment-26388711-20190216192243

That might be the difference between a minor "tweak" and a major "redesign," as minor tweaks which come almost every business day are only applicable in a given time period, and if the player has internet access. They can prevent their levels from receiving tweaks by disabling internet access. The tweaks may also be retracted at any time. They may not be game-version or app-version specific.

In major redesigns, the master config which comes in the game, is itself redesigned. They are game-version and app-version specific. There is no way to avoid these redesigns unless you choose to disable auto-updating of this game.

In FB, you are always online, so all tweaks and redesigns are the most current one.

As of now, every major redesign is identified of the form "E###" where the "###" is a three-digit number representing the latest HTML5 episode released or about to release since the major redesign has been applied. Every tweak is identified of the form "E###a" where "###" is the latest episode released so far since the tweak, and "a" is a lowercase letter {a,b,c,...} indicating the number of times the config has been tweaked before.