Hi everyone,
As it seems that many players are (understandably) confused somewhat by these new tiered prime days - we'd like to post a hopefully more clear explanation than the previous one.
Both the explanation, as well as the visual display in-game seemed to result in a misunderstanding of how the offers should function. In order to clarify any misunderstandings we would like to emphasize on the following points, which
will be explained by examples below:
This is the example package which we will use:

In this offer there are 3 tiers - each containing a Khan tablet booster amongst other things:
-
Tier 1 - 2 hours of +350% Khan Tablets looted
-
Tier 2 - 2 hours of +400% Khan Tablets looted
-
Tier 3 - 2 hours of +500% Khan Tablets looted
If you purchase 180,000 rubies - and therefore unlock Tier 3 - then you will
only be credited with the highest booster percentage - in this case 500% - which will run for 2 hours, nothing else, because it overwrites the previous (and lower-) booster percentages. The reason for this is that the boosters have
different percentage bonus values and therefore are
not considered equal. So that means that their run-times will not accumulate/stack/run in series.
You do receive the +350% and +400% booster - however they are overridden by the higher bonus percentage.
The reasoning behind this change is to allow higher percentage boosters to be offered in-game, without demanding very high thresholds for ruby purchases - this way you can choose which level you want to pay for.
If you plan on purchasing more than the full 3 tiers, feel free to open the spoiler, if not - it'll just cause more confusion:
Carrying on with the previous example of the 3 tiers:
-
Tier 1 - 2 hours of +350% Khan Tablets looted
-
Tier 2 - 2 hours of +400% Khan Tablets looted
-
Tier 3 - 2 hours of +500% Khan Tablets looted If you purchase for example
230,000 rubies on the offer above - you would unlock all 3 tiers, and tier 1 a 2nd time - this means that you would be technically credited with the following:
4 hours of +350% Khan Tablets looted
2 hours of +400% Khan Tablets looted
2 hours of +500% Khan Tablets looted
This means, that the
+500% Khan Tablets looted will run for 2 hours first, after this has finished - the +400% boost will have run out, and the first 2 hours of the +350% booster will have been used. However, you will still have
2 hours of the +350% booster left - and this will run after the first 2 hours are over.
So say you purchased the booster at 16.00 CEST:
You would have the +500% booster run from 16:00 to 18:00, followed by the +350% booster running from 18:00 to 20:00
Please remember this example in the booster is only relevant for purchasing more than just part of the first 3 tiers

The other type of tiered prime day which you will have seen in-game in the past is as follows:
Tier 1 - 1 hour of 250%Tier 2 - 1 hour of 250%Tier 3 - 2 hours of 250%This sort of offer only contains
boosters of the same value and therefore -
they are cumulative - if you purchase 180,000 rubies in this case,
and unlock all 3 tiers, then you will be credited with
4 full hours of the same boost.We deeply apologize for any difficulties this might have resulted in and hope that any misunderstandings will be cleared by the explanation above.
Cheers,
Angus