Good morning - ha ha - you found it, fab. look for it every friday, it is only valid for a short period.OK. For newer players (especially if you don't have night mode one), just above and fully to the left the huge screenshot there is a small thing that looks like text "Game Insight | Bonus" - be on your device (I was using mobile phone), and come here and open this link. Then there will be option to click on you platform (Google Play for me) and I got it. Or half of it rather.
But I guess this is just normal deviation.
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