The 3rd tab after challenge and ranked is off. For what it is, it doesnt exactly take up much space or anything, yet the problem is that it is the second time that the gamemode featured in that 3rd tab (previously being gungame) is not a part of challenge. To simplify, the problem is that you cannot select the featured gamemode among with other challenge gamemodes. So... I guess to promote the gamemode, you could keep the 3rd tab, yet you should definitely add it to the challenge pull. Or just return to a "new" notification in a challenge tab, notifying about the new gamemode. It just doesnt make sense otherwise.
#Crystal Scramble + 3rd tab next to ranked
weak pecan